Porting our projectiles and firing them in AR

Now we'll make things more interesting by pulling our projectiles from the earlier project in to this AR demo in all their glory. First, though, we'll need to add the source files to the proper folder and then generate project files. To do this, I've made two copies of the project on my local hard drive (which makes GitHub a bit tricky to handle as they're both branches in the same repository); but to keep things simple, I'll work locally with a copy of this branch (simply cut & paste to a new folder):

https://github.com/PacktPublishing/Mastering-Game-Development-with-Unreal-Engine-4-Second-Edition/tree/Chapter-13-AR

And have chapter 12's branch here in my normal GitHub local drive location:

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