Selection doesn't care about dimension, causing multiple bugs

[altrisi]

Example that was here originally:

Selection isn't rendered after changing dimension

Reproduction steps:

• Make a selection in a dimension
• Go to another dimension
• Make a new selection
• Observer the bug (or not observe it)

Small list:

• [ ] Selection doesn't know the dimension the positions are in
• [ ] Selection isn't rendered after changing dimension
• [ ] Markers are not removed when changing dimensions (may be a Carpet bug?)
• [ ] Moving with a selection (theoretically) in a dimension when in another gets the slice from the current dimension
• [ ] Same for setting an area because of the primary reason

[Firigion]

Adding to this: making a selection in one dimension and then changing dimension and making a new one, the old one is neither deleted nor active. When going back to the first dimension, the markers are there, but the selection does nothing.

[Firigion]

Actaullay, the issue is wider: the selection has absolutely no clue about dimension. Since it stores its coordinates as triplets (and not the marker entity), making a selection in one dimension, changing dimension, and the executing a command will affect the coordiantes of the selection, but in the new dimension. To repoduce: -Make a selection in OW -Go to the nether -Run /se move ~ ~ ~

A random portion of the nether will be moved to the player.