Remove OpenCV and add STB #2304

Job	Run time
clang-format	16s
python-lint	5s
ubuntu-clang-build	1m 0s
ubuntu-gcc-build	1m 37s
windows-msvc-build	2m 7s
windows-clang-build	4m 17s
macos-clang-build	1m 52s
ubuntu-clang-test-extended	-1s
ubuntu-clang-sanitizer-test	-1s
ubuntu-clang-sanitizer-build	-1s
ubuntu-clang-test	-1s
ubuntu-clang-sanitizer-test-extended	0s
ubuntu-gcc-test	-1s
ubuntu-gcc-test-extended	-1s
windows-msvc-test	22s
windows-msvc-test-extended	0s
macos-clang-test	1m 3s
macos-clang-test-extended	0s
ubuntu-gcc-build-codecov	0s
windows-clang-test	30s
windows-clang-test-extended	0s
ubuntu-gcc-build-perf-stats	0s
	13m 3s

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