TOOLS: remove useless crap

Most of the scripts in TOOLS seem entirely useless. Remove them.
There were about 3 types of scripts:
- apparent developer tools (like file format dumpers, benchmarks)
  => I doubt any mplayer developer still alive even uses these
- helpers for encoding or ripping stuff
  => mencoder is gone, at least from this version of mplayer
- helpers meant for users (launching mplayer in weird ways, etc.)
  => just no, it will cause you more pain than gain
So no, there is nothing useful.

Under the scripts not deleted, these are needed for building mplayer:
  file2string.py
  matroska.py
  vdpau_functions.py
These might have _some_ use (but still questionable):
  binary_codecs.sh
  checktree.sh

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