Allow the special level and dungeon compilers to handle input
files which have CR+LF delimited lines. Apparently Cygwin doesn't
convert MSDOS style line ends into newlines the way stdio should
do for text I/O. The resulting unexpected CR characters result in
syntax errors.
And explicitly using '\n' on both the lex and yacc sides of
MAP processing allows removal of the old NEWLINE hack for Mac MPW.
It won't matter what numeric value that character escape sequence
has internally.
This patch allows the digits 0-9 to be used to indicate line numbers
in the MAP...ENDMAP arrays of level files. This makes it a wee
bit easier to place features. The digits get stripped out before
the map is interpreted.
