[UI/UX] It should be possible to remove the key from a macro

[0dminnimda]

Right now I only see a way to add a key, not remove it.
I'd expect being able to do something along those lines:

->

or

->

The only way I've found to remove one key is to delete the whole "line" and recreate it the way I want, and if there were not just one simple key, it feels really bad recreating it. (or editing it via text window, which is also not the most user friendly way)

Version 0.7.1