* [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
+ some are doxy others are just comment code.
+ some minor whitespace and grammatical tweaks.
+ app/SCL/* typos have also been submitted upstream (https://github.com/stepcode/stepcode/pull/366). So it's ok to merge them in to master.