Rename the plugin directories for modeler and model owner plugins

Issue information

From user: jurgenhaas

Contribution record

Fork management

Problem/Motivation

For some reason, we've started with directory names like modeler_api_modeler and modeler_api_model_owner which is not best practice.

Proposed resolution

Change the directory names to ModelerApiModeler and ModelerApiModelOwner.

Edited by drupalbot
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