Improvement sprint v0.4

[smlpt]

Added

• Add +/- buttons to quickly adjust volume transparency inside VR
• Unconnected spots can be linked continuously with the controller tracking tool
• Added volume lensing toggle to aid dataset exploration and annotation in dense areas
• Edges can be selected and deleted with the same behaviors as spots

Removed

• Disable Ctrl-Scroll behavior from sciview in manvr3d, as this would cause the volume to shift forward/backward without the 3D instances to inherit the transformation

Fixed

• Moving the dataset is now possible when the volume is invisible (it will be turned visible for the duration of the transformation)
• Using cosmetic spot scaling now also influences the apparent size of the cursor, making it consistent
• Link colors update immediately on color mode changes
• Link colors now properly reflect the assigned tag sets
• Moving the dataset now respects the user-defined track visibility window
• Fix focus & timepoint syncing when using arrow keys in trackscheme together with manvr3d in a group lock