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Refactor `MxRect32`, `MxSize32`, `MxPoint32` to use MFC base classes #5110

Job	Run time
MSVC 4.20	1m 33s
Current MSVC	1m 31s
Current msys2 mingw32	4m 11s
Current msys2 clang32	5m 19s
Download original binaries / fetch	3s
Compare with master	1m 56s
Upload artifacts	0s
	14m 33s

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