RA2Mode-free build configuration

[chaserli]

For most YR mods it's pointless to consider RA2Mode compatibility. Certain hooks can be debatable (for example #20 ). I suggest adding a build configuration that ignores everything related to RA2Mode.

[Belonit]

Yes. You're right. This is what I'm going to do soon

[Belonit]

Ok. This issue has been resolved. All CnCNet-RA2/YR specific things have been moved to the HardEnd build