* [TD]allow DrawViewAnno to be attached to another view
* [TD]allow image and spreadsheet attach to view
* [TD]ensure correct parent in scene
* [TD]refactor command helpers to separate file
- gathering the helpers in one place
- helper redundancy to be address in another change
* [TD]create symbol, spreadsheet, image with parent
* [TD]fix claimChildren for some views
- also includes many lint fixes
* [TD] remove unused headers
- also some sorting
- also improve readability by not using an abbreviation (we consistently don't abbreviate class names)
- separate validation, geometry and reference handling into
individual files
- improve 3d reference geometry handling
- eliminate duplicate dim creation code
- add Dimension reference repair dialog
- Refactor formatting out of DrawViewDimension
- move dimension repaint control to ViewProvider
* do not emit dragFinished() signal inside mousePressEvent as nothing has been done. This avoids to create an empty transaction and doesn't touch the document
* inside mouseReleaseEvent() check if the mouse has been moved and only if yes emit the signal
* improve error handling in mouseDoubleClickEvent
* in mouseDoubleClickEvent start to edit the view provider
* reimplement ViewProviderDimension::setupContextMenu() to show menu item to start editing it
* fix TaskDimension::accept() and TaskDimension::reject()
also fix issue that tolerance could be set despite theoretically exact is true under some circumstances
also some wording improvements
also a minor fix to use 0.0 instead of DBL_MIN
