Revert "Add C++ bindings for module_backend"

This reverts commit e7ff6791b1d3d9d5dc0ed835b3b3b7d38ee260a3.
Revert "Add module_backend implementation"

This reverts commit 6488274301a6e627cc52f1984d479de84b3ca495.

Conflicts:
	example/module_backend/module_backend.c
Revert "Add -H option to dnet_ioclient"

This reverts commit aa648e895c25d114bd89b65b683fa8778931b999.
v2.23.4.2