TODOs from codebase

[K-Meech]

Copied over some todos found while tidying up the codebase:

• neaten up code structure, possibly clearer labelling of which coordinate system & units are being used

• check degree symbols work on mac

• add cutting-plane to target distance in cutting mode (would be nice check for me for distances, and could be useful for folks to plan their runs)

• make plane update as efficient as possible

• Add some buttons for e.g. reset view, centre view for microtome, centre view for sample etc

• Add a check that target plane is behind block face (or intersects it)

• make GOTOs match normals properly? Issue is imglib2 uses a coordinate system from top left so normal vector t calculates is into page not out of it, like our target normals are set?

• make generic for any bit depth - currently only accepts 8 bit

• make it so transparency panel doesn't appear if plane not initialised

• do checks for legitimacy of values when load from settings? e.g. that vertices lie on the block plane

• make so doesn't show windows until all loaded?

• check against original blender solution. Make mock file for case of intersection with block face - check how two solutions compare