* Support generic reading and writing FIT developer fields
* Move coretemp to generic DEVELOPER fields
* Add additional type info for fit dev fields
* Add example fit roundtrips
* Clean up CIQ format
* Switch to embedded json for ciq field
* Format json string and reduce tab width on extra tab text box
* Store type name as string rather than index
* Add scale, offset and message metadata to ciq developer fields
Fixes#2553
