- TodoObject.get_children accepts an obj_type to filter by
- Todo._get_parent accepts an obj_type to filter potential parents
- Todo._parse_category now properly assigns parent categories
- Reworked get_* methods in Task, Category, and Note to use get_children
- now properly outputs category spacing in get_md()
- removed task_spacing and note_spacing, may return later.
- fixed parent assignment, now iterates through the reversed children
list.
- this finds the closest parent.
- TodoObject now properly returns output with get_children()
