Larger World, Brain, Batching, Animations, Loading

Made world larger (7 nodes per dimension)
Made nodes spawn within grid cells rather than intersects.
Added placeholder central "brain".
Removed multipass shader i made from uninfected nodes because batching
doesnt work with multipass shaders. May have to create second cube
around outside.
Changed look of nodes and cubes.
Changed player ship model.
Made nodes animate coming into existence. Nodes expand and cubes expand
as well but for longer.
Made links animate, fading towards linked nodes and back to infected
nodes when linking and unlinking. May be a problem when a new node is
linked, causing link to jump to new node, but not a severe bug.
Made enemies use the same material, not instances of the material, so
they can be batched.
Added a loading overlay before the game begins. This loads all the pools
etc. and connects to the wiki websocket.