Switch the vector type to EASTL

[0xC0000054]

I have been testing a few of the methods that take or return std::vector, e.g. cISC4BudgetSimulator::GetAllGroups and cISC4TractDeveloper::GetActiveStyles. These methods cause the game to crash when accessing the internal layout of the C++ type.

I fixed the crash by switching the vector type to the EASTL equivalent, which has the internal layout that SC4 expects. I configured EASTL to use SC4's cIGZAllocatorService for its memory management, which appears to be what the game's vector type uses on Windows.