Gocart

- **FIXED**: a bug in filtering routine that caused alerts to pass the filtering algorithm if an unknown parameter in the filtering settings was found. It now fails by default instead of passing.

- **FEATURE**: gocart can now run in daemon mode. Use the commands `gocart listen|quit|restart|status`
- **ENHANCEMENT**: added an `event_dir_exist` parameter to the filtering criteria. If a previous event alert has passed the filtering criteria, it is now possible to allow all subsequent alerts will pass
- **ENHANCEMENT**: redshift range added to the right side of aitoff plots
- **REFACTOR**: removed `ligo.skymap` dependency as this is a huge package and was causing upgrades of gocart to take 20-40 mins. Required new code to convert multi-order skymaps to a single-order (I was previously relying on a function in `ligo.skymap` to do this)

- **FEATURE**: user can now add their own plugin scripts to run every time an alert is parsed
- **ENHANCEMENT**: added a count of alerts read when first connected to kafka (gives users peace of mind that goacrt is working)
- **FIXED**: area calculations fixed (I was still sort by prob but should have been sorting by probdensity for mulit-order maps)
- **FIXED**: can still read an event ID even if not found in the sky-map header (tried to find the event ID from the map directory path)

- **FIXED**: listen command was tripping up on mock-events

- **FEATURE**: filtering of alerts is now possible via options in the settings file (see docs)
- **ENHANCEMENT**: option added to write the original json alert to file
- **ENHANCEMENT**: gocart *should* be robust enough to handle burst events (tested against a hand crafted burst alert packet as none exist in the LVK Public Alert Guide yet).

- **REFACTOR**: splitting mockevents from superevents