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Now, the extension is actually checked before opening the ROM.
Streaming ROMs (MVC) are already taken care of, but still TODO is limit read to Cart::maxSize().

Still TODO is deal with large files other than MVC, and also ZIP files.
At least the logic for analyzing size is now in one method (OSystem::openROM).

Fixed some minor issues in VS project.
Minor formatting fixes.

modified UA bankswitching accordingly

I spent a lot of time trying to eliminate warnings in the Windows version of this
function, only to realize it's only ever used in POSIX-specific code!

compiling.