2.0 Allow to go back after a jump

[Jowan-Spooner]

Basically this allows you to set a Jump event as a "checkpoint" and then at any time use another jump event to go to the last checkpoint (this could go multiple levels deep).

This allows you to go to a different timeline and then return from where you came from.

The UI is honestly quite bad right now, but it seems to work well.

Outdated images:

[coppolaemilio]

I would update the language to call them checkpoints. So: "Checkpoint" and "Return to last checkpoint"

[coppolaemilio]

Leaving the screenshot with the mockup here

[Jowan-Spooner]

Converting this to a draft as it shouldn't be merged. I would like to keep it until I remake the PR, just so we keep the reference for how it should be.

[coppolaemilio]

Unfortunately it is outdated.