Campbell Barton e535ff44ff Undo System: remove accumulate/store modes
This complicated handling of undo steps in a generic way
especially switching between undo systems that stored data to ones
that accumulated changes.

Now each undo system must treat it's steps as check-point,
internally it can apply/rewind changes.

This commit also fixes projection paint where the object mode wasn't
following the undo steps.
2019-02-06 11:52:04 +11:00
2019-01-22 12:50:13 +01:00
2010-10-13 14:44:22 +00:00
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