Fix import errors - and running across game detection problems

Last one:

Error! Unable to start Wrye Bash.

Please ensure Wrye Bash is correctly installed.

Traceback (most recent call last):
  File "bash\bash.py", line 454, in main
    import bosh
  File "Wrye Bash Launcher.pyw", line 63, in load_module
    mod = imp.load_source(fullname,filename+ext,fp)
  File "bash\bosh.py", line 69, in <module>
    from game.oblivion.RecordGroups import MobWorlds, MobDials, MobICells, \
ImportError: No module named RecordGroups

Well turns out that game/oblivion.py and game/oblivion was confusing python
which spit out the quite unhelpful "No module named RecordGroups"

Moving oblivion.py to game/oblivion/ completely ruins the game detection
algorithm though