Improve replay functionality

• Add button that opens folder with replay files if possible
• Disable replay selection list when in replay mode / allow to switch to other replay
• Add slider to indicate currently available/loaded range
• Add loading indicator when slider is in unloaded range
• Investigate whe some scene parts only load when play is enabled (not while paused)
• Use async loading and similar to improve loading speed
• Fix program crashing when starting recording while disconnected from storage
• Wait for reconnect to save recording
• Delete old First Timestamp and Last Timestamp Information and convert them to time date format

Requires:

• sw/armarx/robot-api#123 (closed) / sw/armarx/robot-api!309 (merged)

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changed title from Add button to replay window that opens folder to Improve replay functionality

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created branch 197-improve-replay-functionality to address this issue

mentioned in merge request !124 (merged)

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assigned to @uiswu_brestel

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marked the checklist item Fix program crashing when starting recording while disconnected from storage as completed