REPC improve comment handling

Allow comments at beginning of file as well as multiple
comment lines.

Change-Id: I821b26068da5133213c357840df536c735a28d2b
Reviewed-by: Continuous Integration (KDAB) <build@kdab.com>
Reviewed-by: Kevin Funk <kevin.funk@kdab.com>
Reviewed-by: BogDan Vatra <bogdan@kdab.com>

src/repparser/parser.g

@@ -558,11 +558,15 @@ bool RepParser::consumeRule(int ruleno)
     switch (ruleno) {
 ./
 
-TopLevel: Types | Newlines Types;
+TopLevel: Types | Newlines Types | FileComments Types | Newlines FileComments Types;
+
+FileComments: Comments;
+
 Types: Type | Type Types;
 
 Newlines: newline | newline Newlines;
-Comments: comment | comment Newlines;
+Comments: Comment | Comment Comments;
+Comment: comment | comment Newlines;
 Type: Include | Include Newlines;
 Type: Pod | Pod Newlines;
 Type: Class;