What we need is for this to work exactly like we handle Info.plist:
- Load/Create our default Entitlements.plist.
- Merge custom Entitlements.plist in the project root.
- Merge keys set in tiapp.xml under <ios>/<entitlements>
- Do whatever we automatically generate, but only if the key does not already exist (alternatively, do this step after the first so it will be overwritten by the user's keys)
Ideally we would rename <ios>/<plist> to <ios>/<info> but that would break all apps