Add debugging console

[sakura57]

To make debugging and testing new features easier, the game should have a debugging console. A UI panel class was started, but has yet to be finished.

From here, the player should be able to issue commands, such as:

• Warp to base/sector
• Give equipment
• Give money
• Spawn NPC
• View material pool and assocs
• Execute lua scripts

The console should be extensible. Adding new commands should be quick and easy.

To-do list:

• Finish console UI panel (DebugConsole)
• Create console manager class and abstract console command class
• Implement a rudimentary set of console commands that can be later expanded
• Link console manager to console UI panel

[sakura57]

Merged #22