unify(common-rts): Move Common/RTS to Core

[Jaredl-Dev]

This moves the remaining shared low-risk Common RTS files into Core:

• Handicap.h / Handicap.cpp
• MissionStats.h / MissionStats.cpp
• PlayerList.h / PlayerList.cpp
• ResourceGatheringManager.h / ResourceGatheringManager.cpp
• Science.h / Science.cpp
• ScoreKeeper.h / ScoreKeeper.cpp

The moved files are code-identical between both games except for the product-name license banner. ResourceGatheringManager.cpp also corrects a comment spelling.

Verification

• Verified all Core files byte-match their Zero Hour sources.
• Win32 Release build succeeds.
• VC6 Release build succeeds.

[Skyaero42]

ResourceGatheringManager.cpp needs to have a merge first (separate commit) before being merged.

[xezon]

How about merge all the Common/RTS files first, then move them all?

[Jaredl-Dev]

How about merge all the Common/RTS files first, then move them all?

I will revise this PR when I have the opportunity.

[Jaredl-Dev]

How about merge all the Common/RTS files first, then move them all?

I’ve rebuilt this PR, and for now there’s only one commit. The first commit simply merges the files so that Generals and Zero Hour use the same code.

What I’m unsure about is whether I’ve implemented the CRC gating correctly, or if I’m even heading in the right direction with it. (I doubt it)

I’ve also put comments and dead code behind CRC gates to at least distinguish which source they came from. That should make a later cleanup easier, although I know that cleanup is out of scope for this PR.

I’ll do the actual unification commit and update the PR body once I get some direction on whether I’m heading in the right direction.