[FEATURE REQUEST] More search API filtering query params

The search API is pretty limited to text and status search right now. Being able to filter tasks (like in the interface) is very useful for plugins. Some additional query params I'd like to see added to the API:

• descendent of task only (or parent tasks)
• start date (before, =, after)
• due date (before, =, after)
• status (ranges, e.g. 0-9 or 50-75)
• tags
• assignees
• created, edited (particularly after a given date, for bulk processing)