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.
SPCRE
Currently, it is mostly a direct port of Google's C++ wrapper
around PCRE for Symbian so there is still quite a bit lacking.
* Add Locale support
* Support more PCRE options in TRegExArg
* Refactor to use more templates and less macros in TRegExArg.
* Full UCS2 support and not just UTF8. Unfortunately, this may slow things down
as PCRE doesn't support this natively so some wastefull conversion will have
to take place.
* Port unit tests over to TEF. Will get rid of lots of code duplication.
* Include CRadix parsing