Embed a Python interpreter, add a way to load Python script plugins

[emezeske]

No description provided.

[emezeske]

The things that I'd like to see exposed to the Python scripts include, but are not limited to, the following:

• World::get_block()/mark_chunk_for_update()/etc
• Sky and Sky::Profile for eventual weather effects
• Various Player stuff (allow Python to control primary/secondary fire, move Player, etc)

[blak3mill3r]

Any python file in a 'plugins' directory should be sourced on game init, these plugins should define python classes which should implement at least 'init' and 'destroy' for starters