Small tweaks to the CreateTypedefs pass

[ds5678]

• <PrivateImplementationDetails> should be Il2Cpp namespace prefixed.
• Revised the definition for injected Cpp2IL types to include any type whose namespace starts with Cpp2ILInjected.
  • For example, using the callanalyzer processing layer produces types in the Cpp2ILInjected.CallAnalysis namespace.

[Kasuromi]

What is the reason behind allowing <PrivateImplementationDetails> to be processed by the generator?

[ds5678]

What is the reason behind allowing <PrivateImplementationDetails> to be processed by the generator?

It was already allowed. This just un-does the portion of #61 that placed it in the global namespace.

[Kasuromi]

It was already allowed. This just un-does the portion of #61 that placed it in the global namespace.

My mistake, I see that now.