Added rescrape in context menu

Ability to re-scrape specific info (NFO, Metadata, trailer, poster,
fanart, etc.) on a single movie via the context menu (right-click on
movie), instead of having to mark the movie to do this.

Moved code from mousedown to cellmousedown as is more appropriate, is a
cell event not a control even
Changed image selection controls

Added full resize, changed to ListView, added ImageList, added size
filter combo
Finished the details - added language string

Just the label and few details.
Added XML highlight and syntax

Automatically done on file open, parse too is executed on load to
highlight errors
Merge pull request #7 from msavazzi/master

resolution filter - Image selection dialog is fully resizable and have now a size filter