Add contemporary mirrorless mounts to fall back list in `lensfun-convert-lcp`

[ClearSights]

When lensfun-convert-lcp fail to determine the mount of a lens, it will fall back to a default list of mounts: https://github.com/lensfun/lensfun/blob/cc4824b88dd4cf163ede74f7407b63d357350098/apps/lensfun-convert-lcp#L880. But contemporary mirrorless mounts like Sony E and Nikon Z are missing here, leading to lens correction failure for some lens (e.g. Viltrox 27mm f/1.2 E). So I suggest to add the following mounts to this fall back list to improve usability:

1. Sony E
2. Canon RF & Canon RF-M
3. Nikon Z
4. Fujifilm X
5. Leica L

[ClearSights]

It has been 2 years since lensfun-convert-lcp in lensfun was updated last time. So it's probably more convenient to maintain a custom version of lensfun-convert-lcp, either locally or in this repo (license might be an issue).

[shenmintao]

I maintain my own version of lensfun here: https://github.com/shenmintao/lensfun, so I will make this change there.

[shenmintao]

Done.

[shenmintao]

I've created a new script called lensfun-convert-lcp-new and try to handle the EXIF information for Sigma and Apple lenses.
However, this is just a starting point, and the script is not yet comprehensive. To make it more robust and useful for everyone, I need more data.
If you or anyone else encounters a lens that is not correctly identified by the new script, could you please help me by collecting and sharing its EXIF information? This data is crucial for me to analyze the failures and improve the script's recognition capabilities.

Thank you for your support

[ClearSights]

Sure. This is the output log after running lensfun-convert-lcp-new with CameraRaw 18.0: https://gist.github.com/ClearSights/733e59435ccc06c36f574677973b6d06. Quite some lens got fall back. Hope this helps.

[shenmintao]

I've updated the search mechanism in lensfun. It should now be able to match more cameras and lenses correctly.