I used to do many project with the old SDK (GVR) and I haven't used the new open sourced one so much so I have a few somewhat basic questions to speed up my project. 1. We used to navigate on the game view with alt + left mouse drag to rotate the head around. Is there a new way to do it or should I just implement my own preview rotation??? 2. Is there a production ready reticle solution or should I implement my own??? 3. Should I go with 2020 LTS (preliminary tests show good compatibility) or Stay with 2019 LTS?