Make ProjectGenerator for iOS release automatically generate main.mm using ofAppiOSWindow

Hey,

in a rather lengthy debugging session (github issue, forum post) I figured out some rendering issues on an iOS openframeworks project that uses 3D.

It turns out that the ProjectGenerator by defaults creates this main.mm

#include "ofMain.h"
#include "ofApp.h"

int main(){
    ofSetupOpenGL(1024,768,OF_FULLSCREEN);          // <-------- setup the GL context

    ofRunApp(new ofApp());
}

My issue got resolved by using the ofAppiOSWindow setup, like so:

#include "ofMain.h"
#include "ofApp.h"

int main(){
    ofAppiOSWindow * iOSWindow = new ofAppiOSWindow();
    iOSWindow->enableDepthBuffer();
    ofSetupOpenGL(iOSWindow, 1024, 768, OF_FULLSCREEN);

    ofRunApp(new ofApp);
}

Despite there also being the iOSWindow->enableDepthBuffer(); which might not be needed for all projects, shouldn't the iOS ProjectGenerator use this form using ofAppiOSWindow?

Start in the iOS ProjectGenerator template that produces main.mm and compare its generated setup with the ofAppiOSWindow example in this issue. Determine the appropriate default window setup, including whether depth-buffer enabling belongs in the template, then verify that newly generated iOS projects contain the intended main.mm.