Support editing

[oktaal]

          I definitely see a possibility of integrating this with Excalibur in a shared library.

Some of my initial thoughts:

• All the editing functionality in Excalibur's component should be turned off in some views. When edit=False it can behave exactly as what you've created here.
• When editing glosses, I think it's more convenient to handle all layers simultaneously in one model (see Gloss in Excalibur). Maybe luupzig could support two modes: supply a single gloss model, or define multiple lines explicitly as done here.
• Because Excalibur is still in early development, I wouldn't want to immediately spend time working on a nice and well designed library. I'd prefer to return to this at a later time, when the application is a bit more fleshed out.

Originally posted by @bbonf in https://github.com/UUDigitalHumanitieslab/mima/issues/41#issuecomment-1514680102