Move MSVC output locations

[DanRStevens]

Use the same folder structure for intermediate and output files for both Linux and Windows.

I figure this might help simplify release packaging. Mostly it just seems cleaner to have all outputs for all platforms in matching parallel folder structures. Makes it very easy to find stuff and compare builds.

Partial work for:

• 1099

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Example output structure (for all platforms): tree .build/ -L 1

.build/ ├── Debug_Linux_nas2d ├── Debug_Linux_test ├── Debug_Linux_testGraphics ├── Debug_x64_NAS2D ├── Debug_x64_test ├── Debug_x64_test-graphics ├── Debug_x86_NAS2D ├── Debug_x86_test ├── Debug_x86_test-graphics ├── Release_Linux_nas2d ├── Release_Linux_test ├── Release_Linux_testGraphics ├── Release_x64_NAS2D ├── Release_x64_test ├── Release_x64_test-graphics ├── Release_x86_NAS2D ├── Release_x86_test └── Release_x86_test-graphics