(cherry picked from commit de3ee0b6f48bb679bd1767613c1e46f720344eec)

fix testcases: transmission type not set correctly, shiftpolygon-calc for hybrids

introduce dedicated powertrain component for IEPC, only for writing correct columns (and column names) in .vmod file
adapt sum-file for IEPC as well

adding testcases for IEPC variants, adding implementation for IEPC wit included transmission - works

DoubleExtensionMethods ToGUIFormat automatically round to 12 decimal digits to avoid floating-point-noise (e.g. 0.56 --> 0.5600000000000001)

check if there is a successor/predecessor before checking shift polygon

handling of REESS components

Corrected typo and added a special label for PowertrainPosition.HybridPositionNotSet: "Position not set"

Renamed the Labels for Retarder Type Primary and Secondary to Transmission Output and Input Retarder