RTAB-Map

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- Added "Mapping->Append Mode" option (default true): when resuming, a new map is created only after being localized with the old map.
- Updated with RTAB-Map 0.11.11 and Tango Yildun.
- In third-person view, we can now move virtually the camera with two fingers.
- Added Data Recorder Mode under Mapping options. This can be used to record Tango raw data at higher frame rate without actual mapping.
- Added smoothing mesh post-processing option