Numerous clip/mask issues fixed related to LPE

For example now you can update filletchanfer knots inside the clippath
Also now you can move knots of corenesrs LPE when are in rect tool
Fix a issue removing powerclip LPE inverse (extra wrong rect removed)
LPE is updated in the clip/mask on apply and on update so no wrong geometry visualy
Also remove a undo crash on knots in clip-mask

Fixes: #3872