(closes#6217)
- Split `actionStraighten` into `actionStraightenWay` and `actionStraightenNodes`
- Now `operationStraighten` chooses the correct action depending on selected entities
- Also move `getSmallestSurroundingRectangle` from `actionReflect` to `geo.js`
* Support move, rotate, reflect, delete post paste on multiselection
* Improve text and error msgs for singular vs multi selections
* Move `disabled` checks from actions to operations
* Reproject center of rotation (closes#3667)
* Cleanup tests