Moves Transitions package to engine-core. Slightly improves some transitions.
Adds Slice and None transitions.
Changes TransitionManager so it can be used within the engine.
Changes Moakp to use the new TransitionManager. Fixes other small bugs.
Adds transition enum to goscene.json.
Changes GoSceneExecutor to use the new TransitionManager.
Adds TransitionsDemo.
copyToProjectIfNeeded result path fix.
Now the selection is sorted.
Adapted ReorderSelection
Merge pull request #857 from RotaruDan/engineTransitions

Engine transitions
Merge pull request #858 from RotaruDan/pathFix

copyToProjectIfNeeded result path fix.
Merge pull request #859 from gorco/minFix

sorted selection
wip