Changes starting unit placement to be the same as Red Alert 2.

[CCHyper]

Closes #338

This pull request changes starting unit placement distance to be the same as Red Alert 2.

As seen in the linked issue, the starting unit placement in Tiberian Sun is awkward and requires the player to micro-manage their units before they can deploy the MCV. Now, with this change, the starting units are placed exactly like Red Alert 2, allowing the player (and the AI) to instantly deploy the MCV at the starting spawn location;

Testing: To aid in testing and observing the AI placement with this feature, a new keyboard command ("Cycle Starting Waypoints") has been added to the developer mode which allows you to cycle between the starting locations on a multiplayer map. It is advised to use this alongside the Reveal Map and Frame Step keyboard commands. Together, these allow you to pause the game and scroll around the revealed map.