Fixes #976 Now uses GitHub to retrieve most current version

Reworked whole Version Checker with an extensible interface to add any other service later on easier.
The version checker now has its own config file, to collect the different options and extract them from the main config file.
In that you can specify how fine the versions should be checked.

src/test/java/appeng/util/UUIDMatcherTest.java

@@ -28,7 +28,7 @@ import static org.junit.Assert.assertTrue;
 /**
  * Tests for {@link UUIDMatcher}
  */
-public class UUIDMatcherTest
+public final class UUIDMatcherTest
 {
 	private static final String IS_UUID = "03ba29a1-d6bd-32ba-90b2-375e4d65abc9";
 	private static final String NO_UUID = "no";