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.

X one
X twoX threeX four
X five
X six
X seven…X eight
X nine
X ten

Before 111
Before 222
Before 333…Match
After 111
After 222
After 333
And so on and so on
And so on and so on