beginning 0.2.01

Only defines s32 and u8 if they're not already defined.
Adds a TODO for TROT_INT_SIZE
Renames NODE_SIZE to TROT_NODE_SIZE and allows it to be defined
Creates a single target.

This target creates a trotSingle.c that is the combination of all trot
source code. This makes it easy to just drop trotSingle.c into a project
instead of linking to trot.