Add pico-8 emulator support

[finger563]

Add PICO-8 emulator support to expand the available game library.

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⚡ Static analysis result ⚡

🔴 cppcheck found 1 issue! Click here to see details.

esp-box-emu/components/pico8/src/pico8.cpp

Lines 246 to 251 in d836257

	memset(buffer, 0, frames * 2 * sizeof(int16_t)); // Stereo
	return;
	}
	// Get audio samples from femto8
	femto8_get_audio_samples(buffer, frames);

!Line: 246 - warning: Either the condition '!buffer' is redundant or there is possible null pointer dereference: buffer. [nullPointerRedundantCheck]

!Line: 244 - note: Assuming that condition '!buffer' is not redundant
!Line: 246 - note: Null pointer dereference

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ESP-IDF Size Report for 'Esp Box Emu'

Metric	Base	PR	Delta
FLASH	3,137,496 bytes (49.87%)	3,137,496 bytes (49.87%)	0 bytes (0.00%)
DRAM	179,439 bytes (52.50%)	179,439 bytes (52.50%)	0 bytes (0.00%)
IRAM	0 bytes	0 bytes	0 bytes
RAM (DRAM+IRAM)	179,439 bytes	179,439 bytes	0 bytes (0.00%)

_{FLASH uses app .bin size or json2 flash sum. RAM sums DRAM+IRAM via idf_size. Percentages shown when totals are available.
DRAM/IRAM usage does not include memory used by the heap allocator at runtime.
This report was generated by esp-idf-size-delta.}