refs #442 Add CPluginManagerSimulator

* Rename CPluginManager to IPluginManager, it is an abstract class now
* Move plugin-related code to CPluginManagerSimulator
* Remove plugin validation from CSimulatorPluginInfo

src/blackcore/plugin_manager.cpp

@@ -66,11 +66,6 @@ namespace BlackCore
 
     bool IPluginManager::isValid(const QJsonObject &metadata) const
     {
-        if (!metadata.contains("IID") || !metadata["IID"].isString())
-        {
-            return false;
-        }
-
         if (!metadata["MetaData"].isObject())
         {
             return false;
@@ -134,4 +129,5 @@ namespace BlackCore
         }
     }
 
+
 } // namespace