Make `ofxPiMapper` own _application`

Additionally implement `ofxPiMapper::loadXmlSettings` method

src/ofxPiMapper.cpp

@@ -1,17 +1,19 @@
 #include "ofxPiMapper.h"
 
-ofxPiMapper::ofxPiMapper(){
-	_application = new ofx::piMapper::Application();
-}
+ofxPiMapper::ofxPiMapper(){}
 
 void ofxPiMapper::setup(){
-	_application->setup();
+	_application.setup();
 }
 
 void ofxPiMapper::draw(){
-	_application->draw();
+	_application.draw();
 }
 
 void ofxPiMapper::registerFboSource(ofx::piMapper::FboSource & fboSource){
-	_application->addFboSource(fboSource);
+	_application.addFboSource(fboSource);
+}
+
+bool ofxPiMapper::loadXmlSettings(string fileName){
+	return _application.loadXmlSettings(fileName);
 }

src/ofxPiMapper.h

@@ -29,5 +29,5 @@ class ofxPiMapper {
 		bool loadXmlSettings(string fileName);
 
 	private:
-		ofx::piMapper::Application * _application;
+		ofx::piMapper::Application _application;
 };