Add TrackerSoftware

[NicholasITL]

Adds Dumplings tasks for the current PDF-XChange end-user packages that already exist in winget-pkgs:

• TrackerSoftware.PDF-XChangeEditor
• TrackerSoftware.PDF-XChangePRO
• TrackerSoftware.PDF-Tools
• TrackerSoftware.PDF-XChangeStandard

Editor uses the vendor build-history RSS feed. The other current package tasks use the product page Current version value because the PDF-XChange RSS feeds are inconsistent across products: PDF-Tools has a current feed, Standard's feed was observed stale, and no PRO feed was found.

Each task adds x86, x64, and arm64 WiX/MSI installers from the versioned downloads.pdf-xchange.com/<version>/... URLs, and extracts current MSI ProductCode and UpgradeCode values for AppsAndFeaturesEntries.

Testing

Ran each task against the live vendor source and inspected structured state:

.\Core\Index.ps1 -Name 'TrackerSoftware.PDF-XChangeEditor' -ThrottleLimit 1 -PassThru
.\Core\Index.ps1 -Name 'TrackerSoftware.PDF-XChangePRO' -ThrottleLimit 1 -PassThru
.\Core\Index.ps1 -Name 'TrackerSoftware.PDF-Tools' -ThrottleLimit 1 -PassThru
.\Core\Index.ps1 -Name 'TrackerSoftware.PDF-XChangeStandard' -ThrottleLimit 1 -PassThru

git diff --check -- Tasks/TrackerSoftware.PDF-XChangeEditor Tasks/TrackerSoftware.PDF-XChangePRO Tasks/TrackerSoftware.PDF-Tools Tasks/TrackerSoftware.PDF-XChangeStandard
git diff --check main...HEAD