Add option to Lattice2 to update LPE only on release knot. This could be useful if item is too complex, making previous knots unusable This can be used in other LPE if anyone want or ping me to it. Maybe could be usefull add similar thing to path parameter, Same slow item become tooooo slow with bend path.

Fix unnecessary inclusion of glibmm/threads.h. This can be resolved by ensuring that glibmm headers always preceed glib.h headers. Same applies with gtkmm/gtk+ etc

Fix coding style issues in lattice2 LPE

Fix a bug in lattice2 with SegmentLines and add a Expander widget to contract all point parameters

Final cleanup to point parameter, lattice2 and perspective envelope. Also added to lattice 2 a symmetry options

Merged pointreseteable parameter to point parameter

Added Latice2 deformation LPE