Feature: Camera Settings Menu

[HeyItsBATMAN]

This PR adds Camera Settings which can be accessed via the menu bar on the bottom right.

Settings that can be accessed right now:

• Switching between an ArcRotateCamera called Orbit and a UniversalCamera called Free
• Changing a Camera Speed setting, which controls a panning speed multiplier, a zooming speed multiplier and the 'walking speed' when in 'Free Camera'-mode
• Resetting the camera, which was the default action when pressing the camera icon previously

Some things to consider:

• As the perspective of annotations is related to the state of the ArcRotateCamera used when creating the annotation, selecting an annotation switches back to the Orbit Camera before setting the annotation's perspective
• The Camera Handler file has been adjusted to better allow the swapping between ArcRotateCamera and UniversalCamera
• Swapping may not always result in the current view/perspective being preserved. Further testing is required for this

Image Preview:

[HeyItsBATMAN]

@lozanaross @ZetOE so this is the current prototype I was able to push out today, in case you want to test it.

[HeyItsBATMAN]

@ZetOE the camera type should probably be locked to the Orbit Camera when in annotation mode. What's your opinion on where to get whether the Viewer is in annotation mode?

[HeyItsBATMAN]

@ZetOE @lozanaross @luguenth see if https://github.com/Kompakkt/Viewer/commit/3b3f6b1def021e606c1d4cca89186f038858c5a1 works for you and whether this also fixes panning issues on large models for you