Added default method `getMeasurementType` in `ObservedMeasurement` that returns the name of the class
Added a constant String `MEASUREMENT_TYPE` in each measurement class to get the class name as a String
Used both additions to improve measurements type checks in tests
Fixes #955

Added a second constructor so it can be used with a collection of
Propagator instead of BoundedPropagator. Also added a test case.

Fixes #954

Some tabs have been preserved in resource test files (EOP data and CCSDS
files) for testing purposes.

Fixes #666

Fixes #895

Fixes #790

Fixes #804

Fixes #936

Fixes #889

Fixes #917

Fixes #921

Merge branch 'issue-919' into develop

Fixes #919

Fixes #909

In Orekit 10 StreamingOemWriter could write an OEM without acceleration,
but in Orekit 11 it couldn't. Now it can. Expanded a test case.

In Orekit 10.x StreamingOemWriter had the option for the user to select
the output reference frame and to not write optional metadata fields.
This commit adds those features to the 11.x branch while maintaining
compatibility with the existing 11.x releases.

A constructor parameter is added to StreamingOemWriter that determines
wheter the reference frame of each segment changes depending on the
state's attitude's frame or if the reference frame from the metadata is
used.

Interpolation degree values less than zero are treated as null when
writing an OEM.

Added a test case.

Fixes #921

Merge branch 'issue-919' into develop

Fixes #919

Fixes #918

Fixes #917

Fixes #909

In Orekit 10 StreamingOemWriter could write an OEM without acceleration,
but in Orekit 11 it couldn't. Now it can. Expanded a test case.