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/noosa/Gizmo.java

@@ -0,0 +1,101 @@
+/*
+ * 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.noosa;
+
+public class Gizmo {
+	
+	public boolean exists;
+	public boolean alive;
+	public boolean active;
+	public boolean visible;
+	
+	public Group parent;
+	
+	public Camera camera;
+	
+	public Gizmo() {
+		exists	= true;
+		alive	= true;
+		active	= true;
+		visible	= true;
+	}
+	
+	public void destroy() {
+		parent = null;
+	}
+	
+	public void update() {
+	}
+	
+	public void draw() {
+	}
+	
+	public void kill() {
+		alive = false;
+		exists = false;
+	}
+	
+	// Not exactly opposite to "kill" method
+	public void revive() {
+		alive = true;
+		exists = true;
+	}
+	
+	public Camera camera() {
+		if (camera != null) {
+			return camera;
+		} else if (parent != null) {
+			return parent.camera();
+		} else {
+			return null;
+		}
+	}
+	
+	public boolean isVisible() {
+		if (parent == null) {
+			return visible;
+		} else {
+			return visible && parent.isVisible();
+		}
+	}
+	
+	public boolean isActive() {
+		if (parent == null) {
+			return active;
+		} else {
+			return active && parent.isActive();
+		}
+	}
+	
+	public void killAndErase() {
+		kill();
+		if (parent != null) {
+			parent.erase( this );
+		}
+	}
+	
+	public void remove() {
+		if (parent != null) {
+			parent.remove( this );
+		}
+	}
+}