Github 242 - Fix missing import in generated .h and correct ns in designer.cs

[Prochy]

Summary

This PR improves how xcsync generates Objective-C / C# interop code and fixes a few related bugs in sync/watch behavior.

The main issue was that generated files were not always correct: some .h files were missing required imports, designer.cs could end up with the wrong namespace, and outlet/action parameter types were sometimes mapped incorrectly when Clang reported pointer-like types such as int*. On top of that, sync/watch gained an explicit types option so generated code can be more predictable when type inference is not enough.

What changed

• Fixed missing imports in generated .h files.
• Corrected namespace generation in designer.cs.
• Improved outlet/action type mapping, especially for Clang-reported pointer types.
• Added support for an explicit types option in sync.
  Currently all action parameters types converted from XCode to C# were created as NSObject event though in a header file was a different type. It's user unfriendly so I extended with -e option (--explicit-types) not to break compatibility. Valid for sync/watch command

Added and expanded tests around the rewriter, type mapping, sync/watch commands, and generated files.
Issue addressed
The issue was that xcsync could generate code that was incomplete or inconsistent:

imports were sometimes missing from generated header files,
generated designer code could use the wrong namespace,
some action/outlet parameter types were inferred incorrectly,
and users had no way to force explicit generated types when needed.

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