fix glsl float interpolation, fix layers on ui reload, add vr thread for Quest

src/layout.h

@@ -18,7 +18,7 @@ class LayoutManager
     struct stat m_file_info { 0 };
 public:
     bool m_loaded = false;
-    std::function<void()> on_loaded;
+    std::function<void(bool reloaded)> on_loaded;
     std::function<void()> on_reloading;
     void unload();
     void create();