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.
+pcre_chartables.obj &
+pcre_compile.obj &
+pcre_config.obj &
+pcre_dfa_exec.obj &
+pcre_exec.obj &
+pcre_fullinfo.obj &
+pcre_get.obj &
+pcre_globals.obj &
+pcre_info.obj &
+pcre_maketables.obj &
+pcre_newline.obj &
+pcre_ord2utf8.obj &
+pcre_refcount.obj &
+pcre_study.obj &
+pcre_tables.obj &
+pcre_try_flipped.obj &
+pcre_ucd.obj &
+pcre_valid_utf8.obj &
+pcre_version.obj &
+pcre_xclass.obj