Bring invasion back to its former glory

Invasion feels like a diluted team slayer now. They added all the regular maps that do not fit invasion gametypes and added invasion skirmish which basically turns invasion into team slayer. 343i bring invasion back to how it used to be!

The only maps in invasion should be:

Spire, Breakpoint, Boneyard, Hemorrage, paridiso, Highlands, Breakneck, and Ridgeline.

The only gametypes should be:

Invasion and Invasion slayer.