change cursor according to annotation tool

[Dagobert42]

URL of deployed dev instance (used for testing):

• https://changecursoraccordingtotool.webknossos.xyz/

Steps to test:

• hover on input catchers
• cycle through active tools

Issues:

• fixes Change cursor according to active tool #4879

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• Updated (unreleased) changelog
• Ready for review

[Dagobert42]

The lasso and new-bounding-box icons are problematic as they cant be filled without further modification. I replaced the lasso with a crosshair and made new-bounding-box dark but its probably not quite what we want.
Also the transposition of the actual clicking position still needs to be fine-tuned.
Regarding this, would you expect A or B here?

[normanrz]

Not sure it is a good idea to replace the built-in cursors, because it makes it harder to know what exact pixel will be targetted.
Also, we need to be careful with copying icons from FontAwesome into our repository. Not sure, if the license permits that.

[Dagobert42]

Not sure it is a good idea to replace the built-in cursors, because it makes it harder to know what exact pixel will be targetted.

Agreed, but I think we found a good compromise with most icons. For now I went through all the SVGs and tried to lign up their click position as best I could.

Regarding the Font Awesome license, I've checked it and it allows for modifications.

[philippotto]

Awesome :) Please update the changelog before merging, though!