* Add API endpoint for background task overview
* Cleanup other pending heartbeat tasks
* Adds API endpoint for queued tasks
* Adds API endpoint for scheduled tasks
* Add API endpoint for failed tasks
* Update API version info
* Add table for displaying pending tasks
* Add failed tasks table
* Use accordion
* Annotate extra data to scheduled tasks serializer
* Extend API functionality
* Update tasks.py
- Allow skipping of static file step in "invoke update"
- Allows for quicker updates in dev mode
* Display task result error for failed tasks
* Allow delete of failed tasks
* Remove old debug message
* Adds ability to delete pending tasks
* Update table columns
* Fix unused imports
* Prevent multiple heartbeat functions from being added to the queue at startup
* Add unit tests for API
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