Start working on script editor help
fix z-buffer issues on x11/mesa
Merge pull request #371 from SystemFail/master

fix z-buffer issues on x11/mesa
Add get_word_under_cursor() method to TextEdit
EditorNode consume F1 key only when Shift or Command key not pressed at the same time
Update EditorHelp to response help request other than class; Make sure EditorHelpSearch dialog popup with search results
Implement Shift+F1 as contextual help hotkey for script editor; There's
one bug that when jump to help tab first time, the scroll position is
wrong.
Merge remote-tracking branch 'upstream/master' into dev