Ping360 scan Sector region and density improvements

## Summary
Could be convenient to change existing Sector Width control (currently called 'Scan Angle (degrees)') to enable user-set angles with a granularity of 1, instead of the existing controls which only allow 60/90/120/180/360.

## Additional information
- Controls could be like the 'advanced' ones so you can type in a number
- Maybe change minimum sector width to 30 instead of 60 degrees (if someone is moving fast and just wants to know if they're likely to run into something, or for detailed inspections with a fast sweep)