Remove references to C plugin API
Remove references to C plugin API

Summary: Found references to C plugin API. Removed and/or replaced them.

Test Plan: Please proof-read the changed content in the PDF

Reviewers: giso, pmaanen

Reviewed By: pmaanen

Subscribers: jenkins-integration-bot

Differential Revision: https://dev.openmha.org/D111

HoerTech-gGmbH/openMHA,HoerTech-gGmbH/openMHA,HoerTech-gGmbH/openMHA,HoerTech-gGmbH/openMHA,HoerTech-gGmbH/openMHA,HoerTech-gGmbH/openMHA,HoerTech-gGmbH/openMHA,HoerTech-gGmbH/openMHA