Added ability to change the deployer bar height mode

Added height mode controls to the deployer bar.

QA:
- drag a charm to the canvas
- click "2 changes" in the deployer bar
- in the top right there will be three height mode icons, clicking on those should change the height of the open panel
- click on "deploy"
- clicking on the height mode controls for the summary panel should again change the height
There are a number of other links that exist in that .action-list so that wouldn't work, however, I could give them a common class (e.g. '.change-mode') and then just one handler for that.