Update rendering code to mesh the chunks

Also unlocked terrain generation, and movement, for all y values.
(no more glass floor)

Some final cleanup fixing framerate

Font rendering!

Added a sample font texture and config file, along with a class to handle this stuff.
Done some 'proof of concept' usage of font rendering.

Chunks are now 'got' via a function that will generate them if required.

For now chunks only try to generate terrain at (chunk)y=0.

Added ability to change what colour to place.

We clean up of the code for adding cubes to the map initially.

So I think this is V2!

Textures are now being applied to the boxes.
I have done a simple AABB collision detect so that the player has some volume.

game detects when you hit the box, adds a point to your score, and le…

…ts you win when you get 3 points.

Yeah, that's right, I'm calling this a game!