Add new project structure and refactors

[skalimoi]

So the game as it's laid out right now is going to change fundamentally - I'm rewriting the project to add all the new features I have worked on in isolation, and to implement a data-driven approach to it. The entire project structure is going to change while retaining the same goals.

The game is going to be conceptualized as a "barebones" simulator that does the dirty job (being a GAME and exposing very complex behaviors, mechanics and scripting API, which is something that most people won't know how to make or do) so that that then, on runtime, it loads the game assets and the user plays the game with those assets. These assets range from models to scripts and definitions, all specified by the end user. Something like Dwarf Fortress, which defines all its units and properties on external files that are easily modifiable.

This will take a while and I also have to include the water simulation extension.