Add Gjs dependency
css-editor: first iteration
css-editor: second iteration

Display files & lines
css-editor: add tooltip with position/size informations
css-editor: cleanup
css-editor: update to new Clutter 1.10 API
css-editor: add missing files
css-editor: fix box layout insertion order
css-editor: tweak font sizes
css-editor: improve description of selected widgets
css-editor: fix widget indexation