Add mechanism for custom ModuleController
Currently there are only ModuleController classes for default PXL
modules.
The user should be able to deploy custom ModuleControllers for his
modules.
This also effects:
- Where should skeleton python scripts be stored (currently in VISPA, better in PXL)
- How do users deploy custom icons for their modules —>module meta information, ModuleStore
(from redmine: issue id 660, created on 2011-05-05 by Robert.Fischer1)