Improve support for Adobe PDF open parameters

This commit adds partial support for Adobe PDF open parameters, specifically we added the page and nameddest parameters, which are similar to Evince's --named-dest and --page-label commandline options respectively.

Some examples of the new parameters supported:

• file:///home/user/Documents/sample.pdf#page=12
• https://arxiv.org/pdf/2310.01425#nameddest=section.3
• sample.pdf#Page=5
• sample.pdf#NamedDest=Chapter4

Evince previously only supported a number-only parameter for opening a page upon loading the document, eg:

• sample.pdf#5
• https://arxiv.org/pdf/2310.01425#7

This support is kept.

Evince already supported passing a file URI in addition to a filename, but the number-only page parameter didn't work when using it in a URI (as described in #2044 (closed)) nor did it work when opening a pdf URI from within an existant pdf (see this testcase pdf).

So, this commit fixes those issues and also updates the Evince man page to:

• Inform of new page and nameddest open parameters.
• Inform that a file URI can also be passed.
• Fix dead links.

Fixes #2044 (closed)