Update momo to be able to build pic24 and pic12 projects
Update momo tool to allow for parallel builds

You cannot run scons via the import command in python. For whatever
reason, it causes the command to hang when you do a parallel build
with -jN.  Running via a simple function wall works.
Add timeout to wait_prompt
Change method from quit to exit to not conflict with momo shell builtin
Change asyncio to be line oriented with a configuratable separator string