Update playground app to use .NET 7

Author: atifaziz

src/DocoptNet.Playground/DocoptNet.Playground.csproj

@@ -1,13 +1,13 @@
 <Project Sdk="Microsoft.NET.Sdk.BlazorWebAssembly">
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net7.0</TargetFramework>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly" Version="6.0.2" />
-    <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.DevServer" Version="6.0.2" PrivateAssets="all" />
-    <PackageReference Include="System.Net.Http.Json" Version="6.0.0" />
+    <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly" Version="7.0.1" />
+    <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.DevServer" Version="7.0.1" PrivateAssets="all" />
+    <PackageReference Include="System.Net.Http.Json" Version="7.0.0" />
   </ItemGroup>
 
   <!--

src/DocoptNet.Playground/wwwroot/css/app.css

@@ -1,7 +1,7 @@
 @import url('open-iconic/font/css/open-iconic-bootstrap.min.css');
 
 html, body {
-    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;    
+    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
 }
 
 body {
@@ -53,6 +53,49 @@ a, .btn-link {
     top: 0.5rem;
 }
 
+.blazor-error-boundary {
+    background: url(data:image/svg+xml;base64,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) no-repeat 1rem/1.8rem, #b32121;
+    padding: 1rem 1rem 1rem 3.7rem;
+    color: white;
+}
+
+.blazor-error-boundary::after {
+    content: "An error has occurred."
+}
+
+.loading-progress {
+    position: relative;
+    display: block;
+    width: 8rem;
+    height: 8rem;
+    margin: 20vh auto 1rem auto;
+}
+
+.loading-progress circle {
+    fill: none;
+    stroke: #e0e0e0;
+    stroke-width: 0.6rem;
+    transform-origin: 50% 50%;
+    transform: rotate(-90deg);
+}
+
+.loading-progress circle:last-child {
+    stroke: #1b6ec2;
+    stroke-dasharray: calc(3.141 * var(--blazor-load-percentage, 0%) * 0.8), 500%;
+    transition: stroke-dasharray 0.05s ease-in-out;
+}
+
+.loading-progress-text {
+    position: absolute;
+    text-align: center;
+    font-weight: bold;
+    inset: calc(20vh + 3.25rem) 0 auto 0.2rem;
+}
+
+.loading-progress-text:after {
+    content: var(--blazor-load-percentage-text, "Loading");
+}
+
 html, body {
     background-color: #21222c;
     height: 100%;
@@ -107,7 +150,7 @@ tt, code {
     border: 1px solid #44475a;
 }
 
-#args {
+#args td {
     color: #bd93f9;
 }
 
@@ -146,8 +189,7 @@ tt, code {
     margin-right: 0;
 }
 
-#result-pane
-{
+#result-pane {
     overflow-y: scroll;
 }
 

src/DocoptNet.Playground/wwwroot/css/bootstrap/bootstrap.min.css

@@ -1,14 +1,14 @@
-[Open Iconic v1.1.1](http://useiconic.com/open)
+[Open Iconic v1.1.1](https://github.com/iconic/open-iconic)
 ===========
 
-### Open Iconic is the open source sibling of [Iconic](http://useiconic.com). It is a hyper-legible collection of 223 icons with a tiny footprint—ready to use with Bootstrap and Foundation. [View the collection](http://useiconic.com/open#icons)
+### Open Iconic is the open source sibling of [Iconic](https://github.com/iconic/open-iconic). It is a hyper-legible collection of 223 icons with a tiny footprint—ready to use with Bootstrap and Foundation. [View the collection](https://github.com/iconic/open-iconic)
 
 
 
 ## What's in Open Iconic?
 
 * 223 icons designed to be legible down to 8 pixels
-* Super-light SVG files - 61.8 for the entire set 
+* Super-light SVG files - 61.8 for the entire set
 * SVG sprite—the modern replacement for icon fonts
 * Webfont (EOT, OTF, SVG, TTF, WOFF), PNG and WebP formats
 * Webfont stylesheets (including versions for Bootstrap and Foundation) in CSS, LESS, SCSS and Stylus formats
@@ -17,7 +17,7 @@
 
 ## Getting Started
 
-#### For code samples and everything else you need to get started with Open Iconic, check out our [Icons](http://useiconic.com/open#icons) and [Reference](http://useiconic.com/open#reference) sections.
+#### For code samples and everything else you need to get started with Open Iconic, check out our [Icons](https://github.com/iconic/open-iconic) and [Reference](https://github.com/iconic/open-iconic) sections.
 
 ### General Usage
 
@@ -33,7 +33,7 @@ We like SVGs and we think they're the way to display icons on the web. Since Ope
 
 Open Iconic also comes in a SVG sprite which allows you to display all the icons in the set with a single request. It's like an icon font, without being a hack.
 
-Adding an icon from an SVG sprite is a little different than what you're used to, but it's still a piece of cake. *Tip: To make your icons easily style able, we suggest adding a general class to the* `<svg>` *tag and a unique class name for each different icon in the* `<use>` *tag.*  
+Adding an icon from an SVG sprite is a little different than what you're used to, but it's still a piece of cake. *Tip: To make your icons easily style able, we suggest adding a general class to the* `<svg>` *tag and a unique class name for each different icon in the* `<use>` *tag.*
 
 ```
 <svg class="icon">

src/DocoptNet.Playground/wwwroot/css/bootstrap/bootstrap.min.css.map

@@ -1,5 +1,6 @@
 <!DOCTYPE html>
-<html>
+<html lang="en">
+
 <head>
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
@@ -9,7 +10,14 @@
     <link href="css/app.css" rel="stylesheet" />
 </head>
 <body>
-    <div id="app">Loading...</div>
+    <div id="app">
+        <svg class="loading-progress">
+            <circle r="40%" cx="50%" cy="50%" />
+            <circle r="40%" cx="50%" cy="50%" />
+        </svg>
+        <div class="loading-progress-text"></div>
+    </div>
+
     <div id="blazor-error-ui">
         An unhandled error has occurred.
         <a href="" class="reload">Reload</a>

src/DocoptNet.Playground/wwwroot/css/open-iconic/README.md

@@ -34,7 +34,7 @@ static IHelpFeaturingParser<T> CreateParser<T>(string doc, Func<ApplicationResul
                 try
                 {
                     var optionsFirst = (flags & ParseFlags.OptionsFirst) != ParseFlags.None;
-                    arguments = ParseArgv(tokens, options, optionsFirst).AsReadOnly();
+                    arguments = new ReadOnlyList<LeafPattern>(ParseArgv(tokens, options, optionsFirst));
                 }
                 catch (DocoptInputErrorException e)
                 {