setModPaths & rebuildModPaths functions

[Ragora]

In the engine there existed two functions:

setModPaths - Accepts a space delineated list of mod names to mount, however, does not immediately mount them upon calling. It accepted more than one, though I am unsure as to how it determined the precedence.
rebuildModPaths - Takes the inputted mod paths to setModPaths and rebuilds the virtual file system to correspond with the new mod paths.

These functions did not seem to really be utilized by anything, so their support is probably at the bottom of the list as right now.

This requires #4 to work.