Make tools generic and add fancy tool groups

Objectives:

* Got rid of mw prefixing in tools, inspectors and dialogs
* Simplify tool classes so they can be generically used as items in bars, lists and menus
* Add support for a catch-all toolbar group
* Simplify tool registration, leaning on tool classes' static name property
* Move default commands to command registry
* Move default triggers to trigger registry
* Get language tool working in standalone

Change-Id: Ic97a636f9a193374728629931b6702bee1b3416a
Merge "Make tools generic and add fancy tool groups"