Revert "Added ElasticDeltaV method, as well as physics and soft body classes"

This reverts commit 9fae47b01ee96140d32e153e7127ee5fced17f78.
Revert "Revert "Added ElasticDeltaV method, as well as physics and soft body classes""

This reverts commit 943a794a9e71bbd9cf72a70b6087ea470374d888.
Merge commit '30a59e1c79fc37e79d3aaf81cc43fc010a1a93b5' into develop