User:Mont29/EnablingNewUndoForStudio

New undo system aims at fixing the main slowness causes of undo in Object and Pose modes.

To use it, please enable, in your preferences: Don't forget to save the settings.
 * In the `Interface` tab, display panel, the `Developer Extras` option;
 * Then, in the `Experimental` tab that appears, the `Undo Speedup` option.

Some notes:
 * While there is no known case currently, there is still a (very small) risk of file corruption, please be very careful with your savings, ideally always check that they reload properly first.
 * Crashes on undo/redo are more likely to happen, so do save regularly though.
 * The speed improvements are not yet working in all cases, some undo/redo steps will remain about as slow as in the old system (this is still being worked on).
 * This new system work on Object and Pose mode undos. Editing and sculpting modes use their own code and shall not be affected e.g.