SDL: switched build system from Ant to Gradle, because Google forced this piece of shit on me with SDK update

If you are getting build errors, delete the directory project/app/build

project/build.gradle

@@ -0,0 +1,15 @@
+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+buildscript {
+    repositories {
+        jcenter()
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:2.2.0'
+    }
+}
+
+allprojects {
+    repositories {
+        jcenter()
+    }
+}