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Refactor `MxRect32`, `MxSize32`, `MxPoint32` to use MFC base classes #5111

Job	Run time
MSVC 4.20	1m 42s
Current MSVC	2m 11s
Current msys2 mingw32	4m 14s
Current msys2 clang32	5m 6s
Download original binaries / fetch	2s
Compare with master	1m 56s
Upload artifacts	0s
	15m 11s

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