move Filament headers to own directory under iOS/macOS

ios/include/filament/gltfio/materials/uberarchive.h

@@ -0,0 +1,13 @@
+#ifndef UBERARCHIVE_H_
+#define UBERARCHIVE_H_
+
+#include <stdint.h>
+
+extern "C" {
+    extern const uint8_t UBERARCHIVE_PACKAGE[];
+    extern int UBERARCHIVE_DEFAULT_OFFSET;
+    extern int UBERARCHIVE_DEFAULT_SIZE;
+}
+#define UBERARCHIVE_DEFAULT_DATA (UBERARCHIVE_PACKAGE + UBERARCHIVE_DEFAULT_OFFSET)
+
+#endif