Update to SFML 3.x vector-based `sf::Rect` #420

Job	Run time
clang-format	11s
Windows MSVC Shared Release	2m 15s
Windows MSVC Shared Debug	1m 32s
Windows MSVC Static Release	3m 7s
Windows MSVC Static Debug	2m 49s
Windows ClangCL Shared Release	2m 59s
Windows ClangCL Shared Debug	2m 29s
Windows ClangCL Static Release	4m 37s
Windows ClangCL Static Debug	4m 12s
Windows Clang Shared Release	1m 51s
Windows Clang Shared Debug	2m 21s
Windows Clang Static Release	2m 53s
Windows Clang Static Debug	2m 6s
Linux GCC Shared Release	47s
Linux GCC Shared Debug	48s
Linux GCC Static Release	1m 13s
Linux GCC Static Debug	1m 14s
Linux Clang Shared Release	59s
Linux Clang Shared Debug	42s
Linux Clang Static Release	1m 32s
Linux Clang Static Debug	1m 24s
macOS Clang Shared Release	1m 0s
macOS Clang Shared Debug	55s
macOS Clang Static Release	1m 14s
macOS Clang Static Debug	55s
	46m 5s

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