Split out detection system from ResourceManager into DetectionManager

* Split detection system out into its own class, DetectionManager
    * Clean up ResourceManger's many callbacks into just two, one for detection and one general purpose

startup/main_FreeBSD_Linux_MacOS.cpp

@@ -87,11 +87,6 @@ int main(int argc, char* argv[])
         }
     }
 
-    /*-----------------------------------------------------*\
-    | Perform ResourceManager cleanup before exiting        |
-    \*-----------------------------------------------------*/
-    ResourceManager::get()->Cleanup();
-
     LOG_TRACE("OpenRGB finishing with exit code %d", exitval);
 
     /*-----------------------------------------------------*\