Converted ShatteredPD to Build from Gradle

Major Changes:
- Shattered now builds effortlessly either from gradle CLI or android studio
- Much better dependency management through gradle (although it's not really used atm)
- Separate PD-classes repo is now SPD-classes module within main repo

SPD-classes/src/main/java/com/watabou/input/Keys.java

@@ -0,0 +1,65 @@
+/*
+ * Pixel Dungeon
+ * Copyright (C) 2012-2015  Oleg Dolya
+ *
+ * Shattered Pixel Dungeon
+ * Copyright (C) 2014-2016 Evan Debenham
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+package com.watabou.input;
+
+import java.util.ArrayList;
+
+import com.watabou.utils.Signal;
+
+import android.view.KeyEvent;
+
+public class Keys {
+	
+	public static final int BACK		= KeyEvent.KEYCODE_BACK;
+	public static final int MENU		= KeyEvent.KEYCODE_MENU;
+
+	public static Signal<Key> event = new Signal<Key>( true );
+	
+	public static void processTouchEvents( ArrayList<KeyEvent> events ) {
+		
+		int size = events.size();
+		for (int i=0; i < size; i++) {
+			
+			KeyEvent e = events.get( i );
+			
+			switch (e.getAction()) {
+			case KeyEvent.ACTION_DOWN:
+				event.dispatch( new Key( e.getKeyCode(), true ) );
+				break;
+			case KeyEvent.ACTION_UP:
+				event.dispatch( new Key( e.getKeyCode(), false ) );
+				break;
+			}
+		}
+	}
+	
+	public static class Key {
+		
+		public int code;
+		public boolean pressed;
+		
+		public Key( int code, boolean pressed ) {
+			this.code = code;
+			this.pressed = pressed;
+		}
+	}
+}

SPD-classes/src/main/java/com/watabou/input/Touchscreen.java

@@ -0,0 +1,116 @@
+/*
+ * Pixel Dungeon
+ * Copyright (C) 2012-2015  Oleg Dolya
+ *
+ * Shattered Pixel Dungeon
+ * Copyright (C) 2014-2016 Evan Debenham
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+package com.watabou.input;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+
+import com.watabou.utils.PointF;
+import com.watabou.utils.Signal;
+
+import android.view.MotionEvent;
+
+public class Touchscreen {
+	
+	public static Signal<Touch> event = new Signal<Touch>( true );
+	
+	public static HashMap<Integer,Touch> pointers = new HashMap<Integer, Touch>();
+	
+	public static float x;
+	public static float y;
+	public static boolean touched;
+
+	public static void processTouchEvents( ArrayList<MotionEvent> events ) {
+		
+		int size = events.size();
+		for (int i=0; i < size; i++) {
+			
+			MotionEvent e = events.get( i );
+			Touch touch;
+			
+			switch (e.getAction() & MotionEvent.ACTION_MASK) {
+			
+			case MotionEvent.ACTION_DOWN:
+				touched = true;
+				touch = new Touch( e, 0 );
+				pointers.put( e.getPointerId( 0 ), touch );
+				event.dispatch( touch );
+				break;
+				
+			case MotionEvent.ACTION_POINTER_DOWN:
+				int index = e.getActionIndex();
+				touch = new Touch( e, index );
+				pointers.put( e.getPointerId( index ), touch );
+				event.dispatch( touch );
+				break;
+				
+			case MotionEvent.ACTION_MOVE:
+				int count = e.getPointerCount();
+				for (int j=0; j < count; j++) {
+					pointers.get( e.getPointerId( j ) ).update( e, j );
+				}
+				event.dispatch( null );
+				break;
+				
+			case MotionEvent.ACTION_POINTER_UP:
+				event.dispatch( pointers.remove( e.getPointerId( e.getActionIndex() ) ).up() );
+				break;
+				
+			case MotionEvent.ACTION_UP:
+				touched = false;
+				event.dispatch( pointers.remove( e.getPointerId( 0 ) ).up() );
+				break;
+				
+			}
+			
+			e.recycle();
+		}
+	}
+	
+	public static class Touch {
+		
+		public PointF start;
+		public PointF current;
+		public boolean down;
+		
+		public Touch( MotionEvent e, int index ) {
+			
+			float x = e.getX( index );
+			float y = e.getY( index );
+			
+			start = new PointF( x, y );
+			current = new PointF( x, y );
+			
+			down = true;
+		}
+		
+		public void update( MotionEvent e, int index ) {
+			current.set( e.getX( index ), e.getY( index ) );
+		}
+		
+		public Touch up() {
+			down = false;
+			return this;
+		}
+	}
+
+}