Reacting to the changes of ie3-institute/simonaAPI#259.

EvModelWrapper needs to be adapted accordingly.

Open question:
EVCS produces some reactive power values itself via cosPhi of the EvcsInput. When calculating EVCS results, should the reactive power of all connected EVs should then be added to the reactive power of the EVCS itself? Because the EVCS active power is just a sum of all EV active powers, but then EVCS reactive power would be the reactive power of the charging station + sum of all reactive powers of connected EVs.

Original discussion: #1234 (comment)

CC @danielfeismann