Remove OpenCV and add STB #2303

Job	Run time
clang-format	16s
python-lint	6s
ubuntu-gcc-build	2m 24s
ubuntu-clang-build	1m 4s
macos-clang-build	1m 41s
windows-clang-build	2m 23s
windows-msvc-build	2m 25s
ubuntu-clang-test-extended	0s
ubuntu-clang-sanitizer-test	0s
ubuntu-clang-sanitizer-build	0s
ubuntu-clang-sanitizer-test-extended	0s
ubuntu-clang-test	0s
macos-clang-test	1m 0s
ubuntu-gcc-test	0s
ubuntu-gcc-test-extended	0s
windows-clang-test	31s
macos-clang-test-extended	0s
ubuntu-gcc-build-codecov	0s
windows-clang-test-extended	0s
windows-msvc-test	24s
windows-msvc-test-extended	-1s
ubuntu-gcc-build-perf-stats	-1s
	12m 12s

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