v0.7.5b: first major portion of rewriting text rendering

some rough edges still need smoothing out

SPD-classes/src/main/java/com/watabou/glwrap/Texture.java

@@ -60,6 +60,10 @@ public class Texture {
 		}
 	}
 	
+	public static void clear(){
+		bound_id = 0;
+	}
+	
 	public void filter( int minMode, int maxMode ) {
 		bind();
 		Gdx.gl.glTexParameterf( Gdx.gl.GL_TEXTURE_2D, Gdx.gl.GL_TEXTURE_MIN_FILTER, minMode );