Added sf\3tshell platform with support for building beagle textshell+fshell ROMs. As part of that: * Added baserom command and tweaked it to be more friendly with SF baselines. * Lots of build fixes Also cd now makes sure the current working directory matches the file system with respect to case.

EXPORTS
	?ImplementationGroupProxy@@YAPBUTImplementationProxy@@AAH@Z @ 1 NONAME ; struct TImplementationProxy const * ImplementationGroupProxy(int &)
	?KAutoStartFshell@@3HB @ 2 NONAME ; int const KAutoStartFshell