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.
---------------------------- Test U1 ------------------------------
1:X one
2:X two 3:X three 4:X four
5:X five
6:X six
7:X seven
8:X eight
9:X nine
10:X ten
---------------------------- Test U2 ------------------------------
12-Before 111
13-Before 222
14-Before 333
15:Match
16-After 111
17-After 222
18-After 333