Multi camera support in SLAM pipeline
This MR implements the plumbing needed for streaming more than 2 cameras to the SLAM tracker.
It also adapts the euroc player and recorder for datasets with more than 2 cameras.
WMR and Index drivers tested to still be working as before. Rift S untested.
Adapting the WMR (for reverb g2) and Rift S to use this functionality is a matter of copying the flow used in the euroc driver and tune it for the headset. I don't have those headsets at hand so I won't risk doing it for now.
Edited by Mateo de Mayo