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/glwrap/Program.java

@@ -0,0 +1,76 @@
+/*
+ * 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.glwrap;
+
+import android.opengl.GLES20;
+
+public class Program {
+
+	private int handle;
+	
+	public Program() {
+		handle = GLES20.glCreateProgram();
+	}
+	
+	public int handle() {
+		return handle;
+	}
+	
+	public void attach( Shader shader ) {
+		GLES20.glAttachShader( handle, shader.handle() );
+	}
+	
+	public void link() {
+		GLES20.glLinkProgram( handle );
+		
+		int[] status = new int[1];
+		GLES20.glGetProgramiv( handle, GLES20.GL_LINK_STATUS, status, 0 );
+		if (status[0] == GLES20.GL_FALSE) {
+			throw new Error( GLES20.glGetProgramInfoLog( handle ) );
+		}
+	}
+	
+	public Attribute attribute( String name ) {
+		return new Attribute( GLES20.glGetAttribLocation( handle, name ) );
+	}
+	
+	public Uniform uniform( String name ) {
+		return new Uniform( GLES20.glGetUniformLocation( handle, name ) );
+	}
+	
+	public void use() {
+		GLES20.glUseProgram( handle );
+	}
+	
+	public void delete() {
+		GLES20.glDeleteProgram( handle );
+	}
+	
+	public static Program create( Shader ...shaders ) {
+		Program program = new Program();
+		for (int i=0; i < shaders.length; i++) {
+			program.attach( shaders[i] );
+		}
+		program.link();
+		return program;
+	}
+}