Feature/kitchen open articulated objects

See merge request !425

Merge branch 'feature/kitchen-open-articulated-objects' of git.h2t.iar.kit.edu:sw/armarx/robot-api into feature/kitchen-open-articulated-objects

Refactor skill memory GUI

See merge request !406

Add segfault skill to SkillProviderExample

See merge request !424

Merge branch 'feature/skillMemoryGUI' of git.h2t.iar.kit.edu:sw/armarx/robot-api into feature/skillMemoryGUI

Make sure statistics for recording are saved if recording is interupted due to stopping the component

- is not connected yet

- query and store needs to call directlyStore, otherwise contents are only put into the buffer but not saved
- tested in Simulation

- time since last acceptance is now calculated per entity and thus filters the snapshots per snapshot for this one entity

- added lastStarted and lastStopped fields in addition to firstStarted and firstStopped
- filter statistics are reset when start recording is pressed
	- resets #accepted, #rejected, additional_time

- changed default path for LTM export to /tmp/ltm/MemoryExport
- changed trigger for when statistics are saved
	- saving directly after a recording was stopped
	- only save statistics if a valid time of start for the recording was detected
	- do not save empty statistics files
	- if no snapshots were accepted or rejected no filter statistics are added and if that is the case for all filters an exception is thrown (and catched which then leads to an empty statistic)
- changed namespace of MemoryBase.cpp to match MemoryBase.h
- FrequencyFilter fix looks at each entity seperately when comparing lastStored times (should solve issues with multiple provider/core segments in one memory)
	- needs to be tested

Add default constructor to RobotReadingSkillMixin

See merge request !421