fix: Don't copy/modify Xcode with iOS native support disabled

[bitsandfoxes]

Resolves #1221

The goal is to "support" exporting the game as a "library". This means the SDK needs to support building for iOS without a native SDK.

The idea is this:

• The SDK should not modify the Xcode project with iOSNativeSupport disabled
  • No modifying of main.mm, options creation, framework/bridge copying
• If the Xcode project has been modified in a previous build and the build gets Appended the build should fail with a clear statement to create a clean build via Replace