Remove most of HexTray and one instance

You can still build HexTray manually if you want to try fixing it

src/common/util.h

@@ -78,7 +78,6 @@ guint32 str_ihash (const unsigned char *key);
 void safe_strcpy (char *dest, const char *src, int bytes_left);
 void canonalize_key (char *key);
 int portable_mode ();
-int hextray_mode ();
 int unity_mode ();
 GSList *get_subdirs (const char *path);
 char *encode_sasl_pass (char *user, char *pass);