Condense app icon themes down to just one, based upon 'gis' theme

- 'gis' theme copied over default
- All other themes removed, available here:
  http://drive.dakotacarto.com/qgis/QGIS-images_pre-gis-theme-switch.zip
- Make sure new default overrides removed themes
- Update some tool buttons for consistency
Put old theme icons back into source tree under themes_ or icons_old next to current directories
[FEATURE] Side Editor for Python Console
[pyqgis-console] fixes prompt save tab on closing
[pyqgis-console] added button to toggle the side editor in python console
[pyqgis-console] some fix for run script and restore tabs
[pyqgis-console] added new toolbar for side editor
[pyqgis-console] added button for comment/uncomment code in side editor and minor fixes
[pyqgis-console] fix shortcut keysequence for side editor
- added class menu removed by mistake
- minor fixes
[pyqgis-console] fix interrupted system call on run script for osx
[pyqgis-console] cleaning up code and minor fixes