implemented navigate functions, added convenience methods to variant visitors where input is already casted, removed aron include from visitors header files (only forward_declarations), fixed missing aron includes, added static methods to visitors to remove code duplication for visitors and converters

added segments for skills and skillexecutions
moved code from statechart listener from own component into skillsmemory

Moved Trajectory to aron::common

- the RobotStateMemory requires a running RobotUnit.

Resolve "ArMem Viewer: Export data to JSON via context menu"

Closes #64

See merge request ArmarX/RobotAPI!200

Also fix a code style issue.

- newTarget was not commited to write buffer

- newTarget was not commited to write buffer in
NJointHolonomicPlatformGlobalPositionController

armem_mps: adding missing dependency, removing include

See merge request ArmarX/RobotAPI!199