Fix preprocessor argument parsing with CRLF line endings

Fixes #11

grammar.js

@@ -117,7 +117,7 @@ module.exports = grammar({
     ...preprocIf( '_in_field_declaration_list', $ => $._field_declaration_list_item),
 
     preproc_directive: $ => /#[ \t]*[a-zA-Z]\w*/,
-    preproc_arg: $ => token(prec(-1, repeat1(choice(/./, '\\\n')))),
+    preproc_arg: $ => token(prec(-1, repeat1(/.|\\\r?\n/))),
 
     // Main Grammar
 

src/grammar.json

@@ -953,17 +953,8 @@
         "content": {
           "type": "REPEAT1",
           "content": {
-            "type": "CHOICE",
-            "members": [
-              {
-                "type": "PATTERN",
-                "value": "."
-              },
-              {
-                "type": "STRING",
-                "value": "\\\n"
-              }
-            ]
+            "type": "PATTERN",
+            "value": ".|\\\\\\r?\\n"
           }
         }
       }