Mutiny Mode

Adds a new game mode, mutiny, to the mix.
http://baystation12.net/forums/viewtopic.php?f=67&t=10143

Features:
* Mutiny mode as a new playable game mode.
* Identification Computer and Accounts DB are given NanoUI facelifts because they are used in most of the Directive X objectives.
* To combat the proliferation of game mode-specific logic across the code base, I've created hooks for several relevant game events by extending Mloc's hooks code.

The current artwork for mutiny mode overlays and round-specific items are placeholders, we're still working on getting finalized artwork so don't merge this until that happens.