- returns empty statistics if getting Statistics from processors does not work (e.g. no processors were used)
- calls save_statistics method from Plugin.cpp after disconnecting component
- save_statistics now takes exportPath and exportName as parameters to build the correct path to the statistics directory
	- statistics directory can be found at: exportPath/Date/exportName/MemoryName/Statistics

- removed functionality that was only needed when recording multiple LTMs in parallel
- removed some old comments and some old ARMARX_INFO code
- added some new try-catch blocks and appropriate warnings

EntityInstance: changed bool to actually not save data in aron.json when extracting
Memory.cpp: rebased code to add date to memory base path to DiskStorageMixin
DiskStorageMixin: added code to save exports of LTM at exportPath/Date/exportName/MemoryName...

# Conflicts:
#	source/RobotAPI/libraries/armem/server/ltm/EntityInstance.cpp

ExportName for LTM exports can be set by adjusting property config file and ArmarX.MemoryName.mem.ltm.exportName property

Also stopped cloning aron data before extraction because that was only necessary for multiple LTMs

Merge branch 'feature/forgetting-in-wm-and-em' of https://git.h2t.iar.kit.edu/sw/armarx/robot-api into feature/forgetting-in-wm-and-em

- decoupled MemoryViewer in GUI from store-Thread of MemoryToIceAdapter
- added status thread to update LogViewer if files are still written and notify it when writing is finished
- removed deep_copy setting of entity instance (not needed if only one LTM is recorded)
- added property definitions for store frequency (BufferedBase) and memoryName (DiskStorageMixin, not fully working yet)

removed old comments, added try-catch for setting export name, added ARMARX_INFO output for export name information

Fix/aron include for projects with namespace

See merge request !400

Feature/visualize force torque

See merge request !399

Minor fixes and improvements in skills

See merge request !398

Remove mutex, make SimpleReaderBase copy-able. Set default properties when used without registerPropertyDefinitions().

Add a named group box for lists if element type not in implementedListDescriptors

See merge request !396

Enable Markdown support in display of skill description in Skill Manager Gui

See merge request !397

(Scoped)SubscriptionHandle to unsubscribe from memory updates

See merge request !391

Skills: Optionals in manager gui

See merge request !395