Introduce filament-utils and Java bindings for camutils.

This library houses the KTX loader, camutils bindings, and a Kotlin math
library. More will come later. Sample app is forthcoming.

android/filament-utils-android/src/main/cpp/Bookmark.cpp

@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <jni.h>
+
+#include <camutils/Bookmark.h>
+
+using namespace filament::camutils;
+using namespace filament::math;
+
+extern "C" JNIEXPORT void Java_com_google_android_filament_utils_Bookmark_nDestroyBookmark(JNIEnv*, jclass, jlong nativeBookmark) {
+    Bookmark<float>* bookmark = (Bookmark<float>*) nativeBookmark;
+    delete bookmark;
+}