Release v1.2.4

- Coding error "NameError" which prevented successful install was fixed.

- New method of mod compilation which never copies/moves a file that
  is going to later be overwritten during installation
  anyway. Significant increase in performance of the install, esp. for
  slow hard drives.

- Generates a file in the target folder called file2mod_map.txt, which
  is a sorted list of every single file your selected mod combination
  includes and, for each, from which mod it came.

- Miscellaneous cleanups and PEP convention fixes.