Build

GenImageFontAtlas added, font example added, LoadFontData function improved #504

Job	Run time
test-purego (1.21.x, ubuntu-latest)	12s
test-drm (1.21.x, ubuntu-latest)	51s
test-examples (1.21.x, ubuntu-latest)	1m 30s
test (1.21.x, ubuntu-latest)	2m 2s
test-rgfw (1.21.x, ubuntu-latest)	58s
test-rgfw (1.21.x, macos-latest)	37s
test (1.21.x, macos-latest)	1m 17s
test-sdl (1.21.x, ubuntu-latest)	1m 0s
test-rgfw (1.21.x, windows-latest)	2m 43s
test (1.21.x, windows-latest)	3m 57s
	15m 7s

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