User feedback on interface

[edantec]

User interface is a little bit counter-intuitive and could be improved by:

• Using the mouse wheel to zoom in and out (or rather move the camera along the view axis) instead of CTRL + left click
• Implementing camera pan mode where we can translate the camera along XYZ (for example with CTRL + left click or middle click)

[ManifoldFR]

Hello @edantec, perhaps you can take a look again and say if the camera controls feel good now?