Merge branch 'TopicReplayerGui' into 'master'

Topic replayer gui

A GUI for playing TopicReplays created by TopicRecorder (ArmarXCore/util).

First version:
- choosing which replay to play
- pausing and resuming
- live-controlling the speed of the replay (currently from 0,1x to 10,0x)

Second version:
- jumping to any position in the replay and continue from there 
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See merge request !28