Unlinker/ObjLoading: Add skeleton for dynamically loading search paths based on current zone

src/ObjLoading/ObjContainer/IWD/IWD.cpp

@@ -0,0 +1,32 @@
+#include "IWD.h"
+
+IWD::IWD(std::string path)
+{
+    m_path = std::move(path);
+}
+
+FileAPI::IFile* IWD::Open(const std::string& fileName)
+{
+    // TODO
+    return nullptr;
+}
+
+void IWD::FindAll(std::function<void(const std::string&)> callback)
+{
+    // TODO
+}
+
+void IWD::FindAllOnDisk(std::function<void(const std::string&)> callback)
+{
+    // Files inside an IWD are not on the disk's file system directly. Therefore do nothing here.
+}
+
+void IWD::FindByExtension(const std::string& extension, std::function<void(const std::string&)> callback)
+{
+    // TODO
+}
+
+void IWD::FindOnDiskByExtension(const std::string& extension, std::function<void(const std::string&)> callback)
+{
+    // Files inside an IWD are not on the disk's file system directly. Therefore do nothing here.
+}