Refactor UTI code

[RhetTbull]

For macOS 11+, the following should work to simplify the uti.py code:

import objc
from LaunchServices import UTTypeCreatePreferredIdentifierForTag, UTTypeCopyPreferredTagWithClass
from Foundation import NSString
import CoreServices
# import LaunchServices

def UTIForExtension(file_extension: str) -> str:
    if not file_extension:
        return None

    # Remove leading dot if included in the extension
    if file_extension.startswith('.'):
        file_extension = file_extension[1:]

    ext = NSString.stringWithString_(file_extension.lower())
    # uti = UTTypeCreatePreferredIdentifierForTag(LaunchServices.kUTTagClassFilenameExtension, ext, None)
    uti = UTTypeCreatePreferredIdentifierForTag(CoreServices.kUTTagClassFilenameExtension, ext, None)
    return str(uti) if uti else None


def PreferredExtensionForUTI(uti_string: str) -> str:
    if not uti_string:
        return None

    uti = NSString.stringWithString_(uti_string)
    preferred_ext = UTTypeCopyPreferredTagWithClass(uti, CoreServices.kUTTagClassFilenameExtension)
    return str(preferred_ext) if preferred_ext else None

# Example usage:
if __name__ == "__main__":
    uti = UTIForExtension(".jpg")
    print(f"UTI for .jpg: {uti}")  # Output should be: public.jpeg

    extension = PreferredExtensionForUTI("public.jpeg")
    print(f"Preferred extension for public.jpeg: {extension}")  # Output should be: jpeg

    uti = UTIForExtension(".mp4")
    print(f"UTI for .mp4: {uti}")  # Output should be: public.jpeg

    extension = PreferredExtensionForUTI("com.canon.cr2-raw-image")
    print(f"Preferred extension for com.canon.cr2-raw-image: {extension}")  # Output should be: jpeg