* switch to selection tool on paste
* align pasting via contextMenu with pasting from event
* ensure only plaintext can be pasted
* fix findShapeByKey regression
* simplify wysiwyg pasting
* improve wysiwyg blurriness
* feat: add line shape
* fix: align line tool
* fix: hitbox bug sw to ne
* fix: add stroke width n sloppiness for line
* fix: center line inside a panel box
* fix: use color as a unique key