Display existings action in the editor

[obzota]

Editor display actions existing on each screen

Openning an ancient dahu project including actions will allow the displaying of those actions. Adding or modifying tools not yet implemented.

Add :

• Generic View Action
• Template for Action

Modify :

• template actions : handlebars already generate a div
• actions : Use generic view for displaying the action collection (getChildView). Specify a className for the handlebar generated
  .
• move, appear & disappear : uniformisation
• main.scss : constrain dimensions of the note textarea in order to display full action list.