migration to blender 2.80

This is an issue to address the migration at large.

To avoid that our library does not support Blender 2.79 nor 2.80, all branches for issues regarding
the migration should only be merged into (and sourced from) the branch of this issue instead of develop.

Please add the issues you create for the migration to this description.

• #202 (closed)
• #201 (closed)
• #210 (closed)