unify(win32device): Move Win32Device to Core

[Jaredl-Dev]

This moves the remaining shared Win32Device files into Core:

• Win32GameEngine.h
• Win32GameEngine.cpp
• Win32OSDisplay.cpp

Generals and Zero Hour differ only by product-name comments, a documentation typo, and an Alt-Tab audio refresh.

Generals gets:

• Alt-Tab audio recovery that reapplies active Miles audio volumes after returning from a minimized window.

Verification

• Verified all three Core files exactly match the Zero Hour source.
• Win32 Release build succeeds.
• VC6 Release build succeeds.

[Skyaero42]

If there are difference between the files (except for the header line), there needs to be a merge before a move.

• Use one commit to merge the files.
• Use a second commit to move the files.

This allows us the clearly review which code snippets are merged an how.

Alternatively:

• Create a PR to merge the files
• Create a PR to move the files.

Look at some of the other merge/move PR's how its done

[Jaredl-Dev]

If there are difference between the files (except for the header line), there needs to be a merge before a move.

• Use one commit to merge the files.
• Use a second commit to move the files.

This allows us the clearly review which code snippets are merged an how.

Alternatively:

• Create a PR to merge the files
• Create a PR to move the files.

Look at some of the other merge/move PR's how its done

I have updated this PR.

[xezon]

Looks correct. Pull id's are missing in commit titles.

[Jaredl-Dev]

Both commit titles now include (#3046).