Remove OpenCV and add STB #2337

Job	Run time
python-lint	12s
clang-format	11s
windows-msvc-build	3m 15s
macos-clang-build	2m 4s
ubuntu-clang-build	1m 13s
ubuntu-gcc-build	1m 33s
windows-clang-build	4m 7s
ubuntu-gcc-test	57s
ubuntu-clang-sanitizer-test	0s
ubuntu-clang-sanitizer-build	0s
ubuntu-clang-test	0s
ubuntu-clang-test-extended	-1s
ubuntu-clang-sanitizer-test-extended	-1s
windows-msvc-test	2m 13s
windows-clang-test	1m 25s
macos-clang-test	1m 22s
macos-clang-test-extended	0s
ubuntu-gcc-build-codecov	0s
ubuntu-gcc-test-extended	0s
windows-msvc-test-extended	2m 9s
windows-clang-test-extended	2m 22s
ubuntu-gcc-build-perf-stats	0s
	23m 1s

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