This commits implements the first iteration of a new evaluation algorithm.
The idea is to always do a full copy of an element that was tagged with
GP_*_RECALC.

Note: This patch only handles drawing and some transform operators in edit mode.
Other operators might not work or not trigger an update. They will have to be implemented.

Demo with the example file from T91945 (12.9 million points):

3.1 Alpha from 2021-12-10:

There is a 1-2 second lag after each stroke is created.

Patch:

The lag after each stroke is a lot less severe but still noticeable. This is due to global undo. Disabling global undo will result in no noticeable lag.