(v3.2.8) - RBC with fixed setpoint values

[AlejandroCN7]

Description

The controller in datacenter has been renamed to be called incremental, then a RBC for datacenter has been created with fixed setpoint values to have one equivalent to the 5-zone RBC.

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Documentation (update in the documentation)
• [ ] Improvement (of an existing feature)
• [ ] Others

Checklist:

• [x] I've read the CONTRIBUTION guide (required)
• [ ] My change requires a change to the documentation.
• [x] I have updated the tests.
• [ ] I have updated the documentation accordingly.
• [ ] I have reformatted the code using autopep8 second level aggressive.
• [ ] I have reformatted the code using isort.
• [ ] I have ensured cd docs && make spelling && make html pass (required if documentation has been updated.)
• [ ] I have ensured pytest tests/ -vv pass. (required).
• [ ] I have ensured pytype -d import-error sinergym/ pass. (required)

Changelog:

• RBCDatacenter renamed to RBCIncrementalDatacenter, then created RBCDatacenter with fixed setpoint values.
• Updated controller tests