bot: refactor and clean up old code

fix: crash when saving old format pwf on hlds
bot: moved sdk headers to separate submodule
nav: improved unstuck and avoidance (thanks @commandcobra7) code
bot: use correct path slashes depending on platform for all data
cfg: removed simplified chines' translation, as it's too outdated

inc/manager.h

@@ -309,7 +309,7 @@ private:
    ThreadPool m_botWorker;
 
 public:
-   BotThreadWorker () = default;
+   explicit BotThreadWorker () = default;
    ~BotThreadWorker () = default;
 
 public:
@@ -322,7 +322,7 @@ public:
          fn (); // no threads, no fun, just run task in current thread
          return;
       }
-      m_botWorker.enqueue (cr::forward <F> (fn));
+      m_botWorker.enqueue (cr::move (fn));
    }
 };