Add Memory Stop Listener

Part of https://git.h2t.iar.kit.edu/sw/armarx-integration/robots/armar7/documentation/-/issues/82

assigned to @kartmann

added 2 commits

• 65616823 - Add kinematic unit stop hook
• c300942e - Catch exceptions from stop hooks

Compare with previous version

changed the description

merged

mentioned in commit 54162cfe