Remove Deprecated Code

[Itaborala]

Before releasing v0.3.0, All deprecated code should be removed. Some files and items have already been marked for removal, but need to be safely done so:

• [x] Remove Old VQH class (but requires that manual functional capabilities are migrated to the new VQHCore or VQHController classes) see #15
• [x] VQHController.current_state is unused Should we keep it or remove it?
• [x] InletLinkedAttribute Class is deprecated
• [x] VQEAlgorithm.run_segmented and similar
• [x] Config related attributes and methods inside SamplingVQE
• [x] VQHMapper.update_clock_speed()
• [x] QuantumHardwareInterface.optimize()
• [x] VQHProtocol, VQHOperator at abstract_classes.py
• [x] All old non-queue adapted SuperCollider mappings and fixed-qubit mappings
• [x] unused parameters in vqe_conf.json
• [x] Old classes at abstract_calsses.py. Remove the full file
• [x] QUBOProblem class
• [x] old files

[Itaborala]

For the purposes of v0.3.0, most deprecated code was removed. For v0.3.1, a new issue can be created.