Moved the class for common asset browser interactions for source files, folders, and source control to atom tools framework.
Added a function to register custom actions
Deleted unnecessary document settings class in favor of settings registry
Signed-off-by: Guthrie Adams <guthadam@amazon.com>
Consolidated duplicate asset browser code from multiple tools into single class in atom tools framework
Moved creation of asset browser and Python terminal windows into base main window class
Fixed docked window orientations
Added checks to asset browser to prevent crashes if tree state saver was null
Signed-off-by: Guthrie Adams <guthadam@amazon.com>