Add file type filters for UDL in Save dialogs #635

Job	Run time
before_build	25s
build_windows_cmake (Release, x64, amd64)	4m 11s
build_windows_msys2 (Release, x86_64)	6m 53s
build_windows (Release, x64)	3m 45s
build_windows (Release, Win32)	3m 37s
build_windows_msys2 (Release, i686)	4m 58s
build_windows (Release, ARM64)	4m 33s
build_windows (Debug, x64)	5m 17s
build_windows_msys2 (Debug, x86_64)	5m 29s
build_windows (Debug, Win32)	4m 33s
build_windows_msys2 (Debug, i686)	4m 2s
build_windows (Debug, ARM64)	3m 26s
	51m 9s

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