make waveform generator class saved in GWT meta data

This MR allows the CBCResult plot to work with non-standard waveform generator classes, as long as the new class takes the same initialisation arguments.

added Feature-request + 1 deleted label

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• 8295af04 - Remove unused import

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changed milestone to %0.6.0

@colm.talbot this looks like it is ready to go, but just failing the CI due to the tests needing updating is that correct?

added 1 commit

• 1b739da0 - Update test to know about new meta data

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approved this merge request

approved this merge request

mentioned in commit 5522a824

merged