Support 2 more voltage regulation modes for generators #1354
Description
Describe the current behavior
Generator can regulate in only 2 possible regulation modes: REACTIVE_POWER, VOLTAGE.
Describe the expected behavior
Generator can now regulate in all 4 possible regulation modes VOLTAGE_PER_REACTIVE_POWER, REACTIVE_POWER_PER_ACTIVE_POWER, REACTIVE_POWER, VOLTAGE.
Describe the motivation
Handle all possible voltage regulation modes for generator objects. Currently missing the VOLTAGE_PER_REACTIVE_POWER and REACTIVE_POWER_PER_ACTIVE_POWER modes.
Extra Information
Blocked by issues in core#3618 and then the adaptation in olf#1353.