Refactored org.conman.string module

I moved all the C code into one module, which is named org.conman.strcore but
populates org.conman.string.

I also updated the Lua part to reflect this new change.
I'm back to using _VERSION.

Added it to strcore.
Remove removed files from Makefile
Move the base64 code to strcore.  Removed the base64 module.
Update the README
Rework how org.conman.syslog() works.

I got tired of typing

	syslog('err',string.forrmat(...))

over and over again.  So, let's always default to doing a string.format()
over the parameters.  Let me make this work for me, instead of me working
for it.
Remove unneeded code.

On second throught, I don't really need the check with lua_gettop().  The
rest of the code does enough checking that it was redundant.
Bug fix---change from "-fpic" to "-fPIC".