Added code to try to figure out the bheavior of WIndows Tables for adding an OnSelected() event.
Made Tables on Windows single-selection.
Scrapped multiple-selection Tables.
Added Table.OnSelected() and implemented it on Windows.
Implemented Table.OnSelected() on the GTK+ backend.
More TODOs.
Changed tableOnSelection() to tableSelectionChanged() in the Windows files for parity with the GTK+ and (next commit) Mac OS X files.
Implemented Table.OnSelected() on Mac OS X.