Upgrade Generals and Zero Hour to x64

[xezon]

• Follow up for Get Generals and Zero Hour to compile with vs2022 & c++20 #471
• Follow up for Replace all inline assembler in Generals and Zero Hour #472

Upgrade Generals and Zero Hour to x64. It must not break the VS6 build and compatibility.

TODO:

• Zero Hour
• Zero Hour Tools
• Generals
• Generals Tools

[Mauller]

Requires moving to DX9 and 64bit versions of bink and miles or moving to alternatives