(svn r17920) -Codechange: add a 'filter' for numbers+spaces and use it for the NewGRF parameter list

src/string_type.h

@@ -18,6 +18,7 @@
 enum CharSetFilter {
 	CS_ALPHANUMERAL,      ///< Both numeric and alphabetic and spaces and stuff
 	CS_NUMERAL,           ///< Only numeric ones
+	CS_NUMERAL_SPACE,     ///< Only numbers and spaces
 	CS_ALPHA,             ///< Only alphabetic values
 };