Split library into seperate files

Split each submodule of the stdbot library into seperate files in
the stdbot/ folder. Currently, the following submodules exist:

 - file

 - graph

 - math

 - memory

 - sensors

 - timer

Within stdbot, variables are now prefixed with __stdbot_<varname>.

Within stdbot submodules, variables are now prefixed with
__stdbot_<modulename>_<varname>.
Updated README

Updated README to include the new submodule systems, and detail how
to #include them in a RobotC project
Update memory manager

Updated the memory manager module to incorporate updates to free()
from JoeCool17/master.
Merge branch 'files' of github.com:mfabel/stdbot

Fixed issue #3

Conflicts:
	stdbot.h
	stdbot_d.h
	stdbot_dmm.h

Fixed merge conflicts by manually overwriting JoeCool17/stdbot/master
with mfabel/stdbot/files.
Merge pull request #3 from mfabel/files

Split Project into Submodules