Reads a pixel at a certain location

@param {String} args The arguments to the command
function ReadpixelCommand(args) {
    var parsed = new statements.ArgumentStatement(args);

    if (parsed.args.length < 2) throw new SyntaxError('READPIXEL command requires 2 arguments');
    this.x = parsed.args[0];
    this.y = parsed.args[1];
}