* implement line editing
* line editing with rotation
* ensure adding new points is disabled on point dragging
* fix hotkey replacement
* don't paint bounding box when creating new multipoint
* tweak points style, account for zoom and z-index
* don't persist editingLinearElement to localStorage
* don't mutate on noop points updates
* account for rotation when adding new point
* ensure clicking on points doesn't deselect element
* tweak history handling around editingline element
* update snapshots
* refactor pointerMove handling
* factor out point dragging
* factor out pointerDown
* improve positioning with rotation
* revert to use roughjs for calculating points bounds
* migrate from storing editingLinearElement.element to id
* make GlobalScene.getElement into O(1)
* use Alt for adding new points
* fix adding and deleting a point with rotation
* disable resize handlers & bounding box on line edit
Co-authored-by: daishi <daishi@axlight.com>
