Implement transport market share constraint

[iuljan]

Market share constraint for transport needs to be implemented.
This constraint sets all different car technologies into relation.
Market share is probably related to the number of cars, this is somehow difficult as no real cars a model but e.g. for BEV a charging_power.

To set the investment into relation. The investment variable therefore needs to be multiplied with the average-charging-power to derive a theoretical number of cars which is then set into relation with an ICE car which variable probably also needs to be multiplied with some factor to derive a theoretical number of cars.