Show Overkill weapons

This shows the Overkill weapons on the "game info" page. Luma icons were only present for machinegun, nex, shotgun, and hmg. The RPC will have a blank icon until a glyph in the font is created.

Note that there is a corresponding PR that will be created on the XonstatDB side to register the metadata info about these weapons. That's the real "fix" that makes them show up.

Please review @martin-t