add android integration & make iOS API consistent

add pubspec android plugin

update android CMakeLists

add filament android libs for linking

android/build.gradle

@@ -2,7 +2,7 @@ group 'app.polyvox.filament'
 version '1.0-SNAPSHOT'
 
 buildscript {
-    ext.kotlin_version = '1.3.50'
+    ext.kotlin_version = '1.6.0'
     repositories {
         google()
         mavenCentral()
@@ -23,9 +23,14 @@ rootProject.allprojects {
 
 apply plugin: 'com.android.library'
 apply plugin: 'kotlin-android'
+apply plugin: 'kotlin-android-extensions'
+
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion 31
+
+    //ndkVersion '21.1.6352462'
+    ndkVersion '23.1.7779620'
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -41,10 +46,23 @@ android {
     }
 
     defaultConfig {
-        minSdkVersion 16
+        minSdkVersion 21
+    }
+
+    
+    externalNativeBuild {
+        cmake {
+            path "CMakeLists.txt"
+        }
     }
 }
 
 dependencies {
-    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
+    compile 'net.java.dev.jna:jna:5.10.0@aar'
+    implementation "com.google.android.filament:filament-android:1.17.0"
+    implementation "com.google.android.filament:filament-utils-android:1.17.0"
+    implementation "com.google.android.filament:gltfio-android:1.17.0"
+    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:1.5.2"
+    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.5.2"
 }