optimise writing of checksum on save scenario
fix ride profit calculation, fixes #603
fix ride shop item colouring in ride window, fixes #602
implement ride open station and ride open vehicle, partial fix for #601
implement enter name on scenario complete, closes #605
Started adding rest of object_list_load
Added more of obj_load
added more of obj_load_list
Fixed one or two bugs with the obj_loader
Fix more bugs. Removed warnings
Cleaned up code. Still failing on some objects
Fix major load bug
Fix remaining bugs. Tidied up the code a little. Removed some debug related parts