Allow loading of LTM exports to the Viewer, although the memory servers have not been started

See merge request !326

Merge branch 'armem_gui/allow_load_inactive_memories_ltm' of https://git.h2t.iar.kit.edu/sw/armarx/robot-api into armem_gui/allow_load_inactive_memories_ltm

Merge of all branches of Fabian PK (related to skills)

See merge request !321

Merge branch 'master' of https://git.h2t.iar.kit.edu/sw/armarx/robot-api into test/merge-branch-skills-to-master

# Conflicts:
#	source/RobotAPI/gui-plugins/SkillManagerPlugin/aronTreeWidget/visitors/AronTreeWidgetModalCreator.cpp

Fix/arrow circle ori

See merge request !328

Add to/fromAron() for one-sided optional and test utilities for C++/Python conversion

See merge request !325

Feature/open fridge

See merge request !317

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

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

allow loading of memories to the viewer, that are not active. The memory viewer indicates that those memories have been loaded from the filesystem and are not available in the MNS by adding their path to the memory name.

update argument type of ltm control widget methods. The key brings no value so passing a vector is enough

Added method to get the states of the available memories checkboxes.