Build each architecture into its own APK

* This means we can have all the architectures we care about installed,
  and load the right library regardless of what the app does.

renderdoccmd/android/Loader.java

@@ -0,0 +1,27 @@
+package @RENDERDOC_ANDROID_PACKAGE_NAME@;
+import android.app.Activity;
+
+public class Loader extends android.app.NativeActivity
+{
+    /* load our native library */
+    static {
+        System.loadLibrary("renderdoccmd"); // this will load VkLayer_GLES_RenderDoc as well
+    }
+
+    @Override
+    protected void onCreate(android.os.Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        // Popup a dialog if we haven't granted Android storage permissions.
+        requestPermissions(new String[]{android.Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
+        // Request is asynchronous, so prevent connection to server until permissions granted.
+        while(checkSelfPermission(android.Manifest.permission.WRITE_EXTERNAL_STORAGE)
+            != android.content.pm.PackageManager.PERMISSION_GRANTED)
+        {
+            try {
+                Thread.sleep(1000);
+            } catch (InterruptedException e) {
+                break;
+            }
+        }
+    }
+}