macOS / iOS - .mm ofApp parsing

[danoli3]

When a template or project has a .mm (objective-c++) ofApp or main the project generator doesn't link to the .mm

Need to make it check if the ofApp.cpp or ofApp.mm / and or main.cpp or main.mm and generate the correct extension

[danoli3]

So where the actual folder contains:

[dimitre]

the solution for that will be adding src folder dynamically instead of having it pre made in the template.
we can use a blue (dynamic) folder also as proposed in this PR
openframeworks/openFrameworks#8179
but this would limit XCode usage to 16+