(svn r7505) -Feature: show NewGRFs used on a game server, show which NewGRFs you do and do not have.

-Feature: show NewGRF compatability of network games in the Game List window; a green square if you got the same OpenTTD version and have the needed NewGRF, a red square if the version does not match and a yellow square if the version matches, but the client is missing at least one of the NewGRFs.

newgrf_config.h

@@ -11,6 +11,7 @@ enum {
 	GCF_SYSTEM,
 	GCF_UNSAFE,
 	GCF_STATIC,
+	GCF_COPY,      ///< The data is copied from a grf in _all_grfs
 };
 
 typedef struct GRFConfig {
@@ -52,4 +53,8 @@ char *GRFBuildParamList(char *dst, const GRFConfig *c, const char *last);
 /* In newgrf_gui.c */
 void ShowNewGRFSettings(bool editable, bool show_params, GRFConfig **config);
 
+/* For communication about GRFs over the network */
+#define UNKNOWN_GRF_NAME_PLACEHOLDER "<Unknown>"
+char *FindUnknownGRFName(uint32 grfid, uint8 *md5sum, bool create);
+
 #endif /* NEWGRF_CONFIG_H */