New frontend agent ticket zoom menu module cluster

This is especially useful if you have a lot of ticket actions enabled. The ticket actions can be clustered into free configurable menus. The most important actions may stay as single buttons while the less frequently actions are available in a separated menu (e.g. called "More..."). The OpenMenuOnHover setting is also considered to ease the access to the sub menus without additional clicks.

Example screenshot:.

![screen shot 2014-11-22 at 02 37 11](https://cloud.githubusercontent.com/assets/3751637/5152318/8bf19a22-71f0-11e4-86a8-5b126109b54c.png)


-- Cheers, Nils