Rando Feature: Edge text to differentiate exits

[Avasam]

When a level has multiple exits, we still have to guess despite having access to the graph. Something like this would be really nice:

(in my example, the level names would be shortened automatically by Initials)

Can be skipped for "unrandomized transitions" if those are marked (see #68 )

If we really wanna be fancy, we can skip for transition types that are unique per level and can be inferred (only 1 one-way, 1 locked door (see #68 ), 1 two-way, etc.) but that sounds like more work than is worth the trouble

(maybe optional as it can lead to clutter, we'll see)

[wossnameGitHub]

Yeah sure I can do that, easy as pie. Except for 2 problems that is:

Problem 1: yes this will lead to an extreme amount of clutter, not sure we want that
Problem 2: I'm not going to do this or anything else for that matter until all changes I've already made are merged