Update to new SFML event polling API #409

Job	Run time
clang-format	8s
Windows MSVC Shared Release	2m 28s
Windows MSVC Shared Debug	2m 24s
Windows MSVC Static Release	3m 5s
Windows MSVC Static Debug	3m 27s
Windows ClangCL Shared Release	3m 7s
Windows ClangCL Shared Debug	3m 13s
Windows ClangCL Static Release	4m 57s
Windows ClangCL Static Debug	4m 38s
Windows Clang Shared Release	2m 20s
Windows Clang Shared Debug	2m 5s
Windows Clang Static Release	2m 48s
Windows Clang Static Debug	2m 31s
Linux GCC Shared Release	52s
Linux GCC Shared Debug	45s
Linux GCC Static Release	1m 29s
Linux GCC Static Debug	1m 1s
Linux Clang Shared Release	1m 0s
Linux Clang Shared Debug	46s
Linux Clang Static Release	1m 37s
Linux Clang Static Debug	1m 38s
macOS Clang Shared Release	58s
macOS Clang Shared Debug	54s
macOS Clang Static Release	1m 7s
macOS Clang Static Debug	1m 4s
	50m 22s

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