(svn r12469) -Codechange: split type related stuff from group.h (and openttd.h) to group_type.h.

src/group_type.h

@@ -0,0 +1,18 @@
+/* $Id$ */
+
+/** @file group_type.h Types of a group. */
+
+#ifndef GROUP_TYPE_H
+#define GROUP_TYPE_H
+
+typedef uint16 GroupID;
+
+enum {
+	ALL_GROUP     = 0xFFFD,
+	DEFAULT_GROUP = 0xFFFE, ///< ungrouped vehicles are in this group.
+	INVALID_GROUP = 0xFFFF,
+};
+
+struct Group;
+
+#endif /* GROUP_TYPE_H */