Start writing a new configuration system

For degesch but in the long term for the rest as well.

degesch.c

@@ -108,18 +108,6 @@ static struct config_item g_config_table[] =
 // All text stored in our data structures is encoded in UTF-8.
 // Or at least should be.  The exception is IRC identifiers.
 
-static bool
-isdigit_ascii (int c)
-{
-	return c >= '0' && c <= '9';
-}
-
-static int
-toupper_ascii (int c)
-{
-	return c >= 'A' && c <= 'Z' ? c : c - ('a' - 'A');
-}
-
 /// Shorthand to set an error and return failure from the function
 #define FAIL(...)                                                              \
 	BLOCK_START                                                                \