Proxy support based on DW's main configuration

[emmanuel-benoit]

Hello, Here is a small patch that solves issue #245 by setting mPDF's curlProxy and curlProxyAuth configuration variables based on Dokuwiki's proxy configuration (if it is set). Kind regards, E.B.

[Klap-in]

Thanks! Looks logic for me, @splitbrain could you have a look as well?

[splitbrain]

Well, in principle this makes sense.

However, preferably dw2pdf would use DokuWiki's own HTTP client instead of relying on curl. That should be possible by implementing our own \Mpdf\Http\ClientInterface

See https://mpdf.github.io/configuration/configuration-v7-x.html#http-client

[emmanuel-benoit]

In this case, please feel free to reject this pull request as I don't have enough time to dig into this at the moment.