LG-VX3200 support update

I have made a pass to address the comments
related to my original LG-VX3200 code.

In summary here are the changes I made:

- enhanced DirCache (com_brew.py) and completely
  removed my original SimpleFileCache class

- added LGBIT support in a more integrated
  fashion to BitPim - similar to BCI

- LGBIT helpers (conversions.py and fileinfo.py)
  are now general purpose, i.e. arbitrary image
  size and support conversion from 8BPP and 24BPP
  BMP files

- replaced the media file suffix mangling with
  a cleaner "remove suffix on way in" and
  "add suffix on way out". This made the comm
  layer (com_lgvx3200.py) cleaner and more
  readable.

- improved the Help - added a few examples.

-- 
Bruce Schurmann
BitPim LG-VX3200 dev




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