Add framework to find multiple glade files in the ui directory
Split glade layout into seperate files for easier workflow.

+ Revert any GTK-3 like changes, but retain fixes we had applied to the glade layout
+ Completely rework the main window to remove un-necessary panes
+ New menu images
Add images to context menu
Remove old glade file line
Fix host network tab
PEP8 fixes
Restructure fill_host_search to be more readable
Add back missing treestore models
Display the host for all VM's on the headlabel
Change seperator before System Alerts button to be not drawn and expand with toolbar
New poweron icon (to match the design of the shutdown etc)
Rework general info tabs for a cleaner feel
PEP8 fixes + Display host UUID on host general tab
Handle error if label does not exist
Display <None> instead of empty string + PEP8 fixes
PEP8 Fixes
Strip the newline character from the end of continuous strings
Remove un-needed python shebangs and correct a couple of spellings
Sort patches and rework how we store multiline properties for general tabs
Another small PEP8 fix