Add action to edit the project configuration in the browser

Add an 'Edit Config' button to the ProjectInfoScreen that creates a
new change for the 'refs/meta/config' branch and opens the
'project.config' file in the EditScreen.

This allows project owners to easily edit the 'project.config' file
from the browser. This is useful since not all configuration options
might be available from the UI.

Change-Id: I4ada81090149b6058a206e0df745b42f33a29b85
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
4 files changed