Marina Car Park asset

Description:
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This mod makes the Marina a buyable asset ($1000). Once you purchase it,
the underground carpark is transformed into a fully operational garage
where you can store upto 40 vehicles. The marina replaces the apartment
building across ken's office as a buyable asset.

For the rest, the game is completely original.

Caution:
As with all main.scm mods, the save games are not compatible with the
original, so you have to start all over. Backup your original savegames
if needed.

Instalation:
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- backup the original main.scm in your GTA:VC data directory and your saved games
- replace the original main.scm with the new one
- copy GTAVCsf1.b to your "My Documents/GTA Vice City User Files" folder
- start GTA:VC and begin a new game or load the first saved game

History:
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The following Issues were solved in release 2:
- The new marina save-point can now safely be used, also with a full garage
- Police-cars are no longer locked when placed in garage
- Secondary colors are now also preserved correctly
The following Issues were solved in release 3:
- Less random traffic on streets when driving cars out of the carpark

Background:
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A couple of weeks after starting GTA mission-modding, I ran into the
limitation of maximum 4 vehicles per garage, and only one spare
garage ID left.
Therefor I tried to recreate the normal garage functionality with
home-made scripting. This is the fruit of my work, and it works
pretty well if i may say so.
The only thing that I would really like to add, is the preservation
of special immunities of cars and car-variations, but the opcodes to
sniff the immunities/variations for a vehicle are yet to be discovered.

I'll donate this code to the gta modding scene. With proper credit
everyone car use this code for their own projects. It allows you to
build as many garages as you like (at a certain storage-cost), and
to support as many vehicles as you like (at a certain
storage/performance-cost upto 40 in each garage).
note: the engine seems only able to have loaded 40 car models at a time.