Add UI dialog for persistent management of settings

[GoogleCodeExporter]

i.e. settings for whether or not the FSI Listener is turned on. These should be 
persisted with some sort of settings file. The settings file should be 
generated on the fly if not present, this will allow easier in-place update of 
new versions of FsEye without overwriting existing settings files (i.e. FsEye 
should not be distributed with a pre-made settings file).

Original issue reported on code.google.com by stephen....@gmail.com on 13 Apr 2012 at 7:14

• Blocking: Add UI settings for Font Family and Size #23, Add setting to filter out zero-arg, non-void/unit methods #41