Upgrade to new SFML 3 `sf::Cursor` API #408

Job	Run time
clang-format	9s
Windows MSVC Shared Release	2m 57s
Windows MSVC Shared Debug	2m 10s
Windows MSVC Static Release	3m 2s
Windows MSVC Static Debug	2m 57s
Windows ClangCL Shared Release	3m 39s
Windows ClangCL Shared Debug	4m 26s
Windows ClangCL Static Release	4m 31s
Windows ClangCL Static Debug	4m 10s
Windows Clang Shared Release	1m 51s
Windows Clang Shared Debug	2m 19s
Windows Clang Static Release	1m 56s
Windows Clang Static Debug	1m 40s
Linux GCC Shared Release	47s
Linux GCC Shared Debug	43s
Linux GCC Static Release	54s
Linux GCC Static Debug	54s
Linux Clang Shared Release	3m 8s
Linux Clang Shared Debug	40s
Linux Clang Static Release	1m 5s
Linux Clang Static Debug	47s
macOS Clang Shared Release	1m 1s
macOS Clang Shared Debug	3m 6s
macOS Clang Static Release	1m 27s
macOS Clang Static Debug	57s
	51m 16s

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