GPU: Add signed int texture formats #51

Job	Run time
Create test plan	7s
level1 / Haiku	1m 35s
level2 / NetBSD	2m 32s
level2 / Ubuntu 20.04 (Intel oneAPI)	6m 12s
level2 / GDK (MSVC, x64)	1m 39s
level2 / Windows (MSVC, x64)	4m 40s
level2 / FreeBSD	2m 48s
level2 / Windows (msys2, clang32)	6m 20s
level2 / Windows (msys2, mingw32)	7m 52s
level2 / Windows (MSVC, clang-cl x64)	3m 26s
level2 / Windows (MSVC, x86)	4m 13s
level2 / Windows (MSVC, ARM64)	3m 22s
level2 / Ubuntu 20.04 (Intel Compiler)	4m 35s
level2 / Android (Gradle)	2m 10s
level2 / Ubuntu 22.04	4m 8s
level2 / LoongArch64	2m 33s
level2 / Windows (msys2, clang64)	5m 32s
level2 / Sony PlayStation 2	4m 32s
level2 / Android (Android.mk)	1m 16s
level2 / PowerPC64	1m 44s
level2 / Android (CMake, lean)	2m 52s
level2 / Sony PlayStation Portable	3m 29s
level2 / Windows (MSVC, clang-cl x86)	4m 24s
level2 / RISC OS	1m 16s
level2 / MacOS (Framework) (x64)	3m 59s
level2 / Windows (msys2, mingw64)	7m 42s
level2 / Sony PlayStation Vita (GLES w/ PVR_PSP2)	2m 59s
level2 / Windows (msys2, ucrt64)	7m 54s
level2 / Emscripten	7m 30s
level2 / iOS (CMake & xcode)	2m 2s
level2 / Android (CMake)	3m 1s
level2 / Windows (MSVC, ARM)	3m 15s
level2 / Sony PlayStation Vita (GLES w/ pib)	2m 59s
level2 / UWP (MSVC, x64)	2m 49s
level2 / Nintendo 3DS	1m 52s
level2 / MacOS (GNU prefix)	2m 53s
level2 / Ubuntu 20.04	4m 6s
level2 / tvOS (CMake & xcode)	2m 21s
level2 / MacOS (Framework) (arm64)	2m 7s
	2h 20m 46s

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