Remove dynamic loading code

All these code are moved into a private repo. The stub is actually
just a stub now; mixing dynamic load and stub is confusing.

stub/src/main/java/a/a.java

@@ -1,6 +1,6 @@
 package a;
 
-import com.topjohnwu.magisk.DelegateComponentFactory;
+import com.topjohnwu.magisk.MainActivity;
 
-public class a extends DelegateComponentFactory {
+public class a extends MainActivity {
 }

stub/src/main/java/a/c.java

@@ -1,6 +0,0 @@
-package a;
-
-import com.topjohnwu.magisk.DownloadActivity;
-
-public class c extends DownloadActivity {
-}

stub/src/main/java/a/e.java

@@ -1,6 +0,0 @@
-package a;
-
-import com.topjohnwu.magisk.DelegateApplication;
-
-public class e extends DelegateApplication {
-}

stub/src/main/java/a/h.java

@@ -1,6 +0,0 @@
-package a;
-
-import com.topjohnwu.magisk.dummy.DummyReceiver;
-
-public class h extends DummyReceiver {
-}