move parts to new common component to avoid circular dependency of zonecommon and objcommon

src/Common/Game/IW4/GameIW4.cpp

@@ -0,0 +1,40 @@
+#include "GameIW4.h"
+
+#include <algorithm>
+
+#include "IW4.h"
+
+using namespace IW4;
+
+GameIW4 g_GameIW4;
+
+const std::string GameIW4::NAME = "IW4";
+
+const std::string& GameIW4::GetName()
+{
+    return NAME;
+}
+
+void GameIW4::AddZone(Zone* zone)
+{
+    m_zones.push_back(zone);
+}
+
+void GameIW4::RemoveZone(Zone* zone)
+{
+    const auto foundEntry = std::find(m_zones.begin(), m_zones.end(), zone);
+
+    if (foundEntry != m_zones.end())
+        m_zones.erase(foundEntry);
+}
+
+std::vector<Zone*> GameIW4::GetZones()
+{
+    return m_zones;
+}
+
+std::vector<GameLanguagePrefix> GameIW4::GetLanguagePrefixes()
+{
+    std::vector<GameLanguagePrefix> prefixes;
+    return prefixes;
+}