Extract engine noise from IGC, add to KML multipath (#1054)

Extract engine noise from IGC, add to KML multipath (#1054)

* Extract engine noise from IGC, add to KML multipath

* Add IGC tests and test files

* Fix kml test suite for extension data.

Note that reference file are stripped of creation times.

* Better way to figure out which extensions are present?

* New IgcMetaData and ExtensionDefinition classes

* Lots of new extensions

* This looks like a better way...

* Minor cleanup

* Dead code removal

* Update IGC->KML reference KML files

* Replace QHash with QList, eliminate evil if ladders

* Many small improvements and cleanups

* Many small improvements and cleanups

* Precision loss fixes, igc_fsdata now templated

* More precision fixes, less templating

* format with astylerc options.

* delete unused include

* convert KmlFormat::wp_field to scoped enum.

* add missed file with scoped enum refatoring changes.

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Co-authored-by: Robert Lipe <robertlipe@gmail.com>
Co-authored-by: tsteven4 <13596209+tsteven4@users.noreply.github.com>