Photoswipe outdated, should be upgraded and made an optional feature

Describe the bug

The embedded Photoswipe copy is an outdated version from 2015:

/*! PhotoSwipe - v4.1.1 - 2015-12-24

However, the nature of the project changed a lot and Photoswipe is not a "simple jQuery based JS library" anymore but requires npm to build as of version 5.

An upgrade to the recent version is strongly recommended.

Furthermore, Photoswipe support should be made an optional feature which is not turned on by default, in both cases (sticking to the old version and upgrading to the new version). When sticking with the old version, users can be warned that they enable support for an outdated JS library. When upgrading to the new version, only users who want to use Photoswipe will require npm at build time. Another reason is that Linux distributions don't like embedded libraries for multiple reasons.

Steps to reproduce

Go to data/pswp in the source code, check version of Photoswipe.

Expected behavior

darktable should not ship with outdated JS libraries.

Logfile | Screenshot | Screencast

No response

Commit

No response

Where did you obtain darktable from?

downloaded from www.darktable.org

darktable version

4.6

What OS are you using?

Linux

What is the version of your OS?

Debian Sid

Describe your system?

No response

Are you using OpenCL GPU in darktable?

None

If yes, what is the GPU card and driver?

No response

Please provide additional context if applicable. You can attach files too, but might need to rename to .txt or .zip

No response