Bugfix: %-ALL AreaFix command would corrupt area uplink list.

Code clean-up:
* Replaced CR and SP macros with char constants.
* Eliminated unnecessary use of CRLF-terminated lines in text files.
* Updated path bufs to use MAX_PATH for length.
* Using SAFECOPY macro for better bounds-checking strcpy's.
* Updated text-file (e.g. AREAS.BBS) string parsing.
* Eliminated unnecessary use of _splitpath()