Create and use neutral domination icons

Create and use neutral domination icons

Previously the blue team highlighted hud icon and the neutral team highlighted hud icon looked identical in domination.
Added icons so they can be differentiated.
Sources
- luma: there was already a file for this in mediasource, which just wasn't used in the game for some reason.
- luminos: edited the TGA, since there was no source in mediasource.
- old: edited the TGA, since there was no source in mediasource.