Re450 Mod: Yellow doors, more capacity and cargo.

Changes the Re 450 's Data incl. allowing the use of it's cargo compartment. Also adds additional Multiple Units. - Higher Capacity for both waggons. - Adds 150m and 200m variant. - Additional use of the Re 450's cargo compartment for endproducts like goods or tools etc. - Adds double Re 450 engine for cargo haulage. - Unlocks the Re 450 engine for free use incl. a reverse version. - Repaints all doors to yellow. Known Bugs: - Changes won't affect trains already in operation. Only newly bought trains get the new capacities. - After buying, the cargo type is set automatically to goods. Change to automatic or whatever before line assignement.