fix: logos config not initialized (resolves #691)

bot: make sure rescue zone icon blinking to consider bot reached rescue zone when escorting hostages (ref #688)
bot: remove hardcoded radio communication randoms, so they're now depends on bots personality
refactor: some refactoring of code

src/vistable.cpp

@@ -179,7 +179,7 @@ void GraphVistable::load () {
    }
 }
 
-void GraphVistable::save () {
+void GraphVistable::save () const {
    if (!graph.length () || graph.hasChanged () || m_rebuild) {
       return;
    }