Improvement of Skill Memory and Skill Memory GUI

See merge request !475

Increased timeout of skill RandomChaining to 2 minutes

This reverts commit cb37cc10.

Improved locking of subskillsMutex during callSubskillAsync to avoid possible deadlock during abortion of skills

Feature/extended robot description

See merge request !473

update list of servers whenever the mns reconnects and a components tries to reaccess a reading/writing service

Loading the last n Snapshots from LTM on Startup

See merge request !469

Diagnostics sub-unit with battery management

See merge request !471

- all Memories can now be used to reload recorded data on startup (tested with Vision, RobotState and ObjectMemory)
	- VisionMemory seems to override the loaded snapshots, this needs more investigation

- properties are part of LTM for now, which is ugly but the only easy way for now to do it

Implemented loading only the newest n snapshots from the given CoreSegments (String has to match core segment name from id)
- n and the names are currently hard-coded but need to be loaded from properties
-

- names are still hard coded at the moment

Currently all snapshots are loaded from all core segments and all days of the memory server.
The method gets called by the memory server component itself.