NEW API: Renderer can process standalone View

New Api:

- Renderer::renderStandaloneView() is a new method that can be used
  outside of beginFrame/endFrame on Views that have a RenderTarget
  associated. This can be used as a poor man's compute API.

Improvements to Renderer:

- more aggressively skip lighting/shadowing code that won't be
  needed by the current view

- Allow up to 64 KiB to be allocated from the render stream, up from
  1 KiB

android/filament-android/src/main/cpp/Renderer.cpp

@@ -50,6 +50,14 @@ Java_com_google_android_filament_Renderer_nRender(JNIEnv *, jclass, jlong native
     renderer->render(view);
 }
 
+extern "C" JNIEXPORT void JNICALL
+Java_com_google_android_filament_Renderer_nRenderStandaloneView(JNIEnv *, jclass, jlong nativeRenderer,
+        jlong nativeView) {
+    Renderer *renderer = (Renderer *) nativeRenderer;
+    View *view = (View *) nativeView;
+    renderer->renderStandaloneView(view);
+}
+
 extern "C" JNIEXPORT void JNICALL
 Java_com_google_android_filament_Renderer_nCopyFrame(JNIEnv *, jclass, jlong nativeRenderer,
         jlong nativeDstSwapChain,