Merge pull request #167 from mtwebster/mtp-mounts-sidebar

Support fuse/mtpfs mounts (like tablets, phones) with the diskfull sidebar indicator
Merge pull request #157 from mtwebster/breadcrumbs

Altering shape of pathbar/breadcrumbs 'buttons'
Rework statusbar:

-Add sidebar on/off button
-Add sidebar places/tree toggle buttons
-Move zoom controls from main toolbar to slider in bottom right corner
-Place old statusbar centered in the new status toolbar

-Make sidebar on/off state a window-level toggle (instead of application-level)
-Make sidebar places/tree state a window-level toggle (instead of application-level)

Removed zoom label, simplified zoom level sync code

Some cleanup

more changes

Use better places icon

Define a smaller icon size for the statusbar