(breaks PE temporarily)
Adds a Standard/Music Application Mode button to SE and thus adds the
ability to run ME scan types in SE. When in Music mode, the
Music-specific results window, details panel and preferences panel will
show up.
All preferences except scan_type become shared between app modes
(changing the pref in a mode changes it in the other mode).
Results Window and Details Panel are now re-created at each scan
operation because they could change their type between two runs.
Preferences panel is instantiated on the fly and discarded after close.
This is a very big merge operation and I'm trying to touch as little
code as possible, sometimes at the cost of elegance. I try to minimize
the breakage that this change brings.
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