Implement basic function to switch between plot engines.

Basic functionality for choosing different plot engines, but at the moment only matplotlib or pyplot is recognized. Small changes to comply with python conventions. A lot of unittests.

added python label

requested review from @m.hock

assigned to @hannes.mayr

added 1 commit

• e14c4147 - Make prefix optional, with empty string as default.

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approved this merge request

mentioned in commit 34688ec8

merged