Editor layouts menu

With this feature you can save your current docks layout, and load it at any time and project.

All layouts are saved in the same file: editor_layouts.cfg (same directory as editor_settings.xml)

Example:

[Test]

dock_4="FileSystem"
dock_5="Inspector"
dock_7="Scene"
dock_hsplit_1=0
dock_hsplit_2=0
dock_hsplit_3=0
dock_hsplit_4=0
dock_split_2=0
dock_split_3=0
dock_split_4=0

[AnotherLayout]

dock_4="Inspector"
dock_1="FileSystem"
dock_7="Scene"
dock_hsplit_1=0
dock_hsplit_2=0
dock_hsplit_3=0
dock_hsplit_4=0
dock_split_2=0
dock_split_3=0
dock_split_4=0

The default layout is built-in, to avoid being deleted manually. Not sure if the best way. Suggestions? :)