Removing the grid

I decided to try removing the grid from the game, so you can effectively create your dungeon in more interesting ways. This was also to avoid just making a clone of the games that inspired it.

I have written various demos to test out concepts to use in this game, such as building the cave geometry and navigation meshes.

My first goal here is to load an initial dungeon and allow the user to tell minions where to excavate. If the game feels fun at that point, I will think about how to turn it into an awesome game.