firefox-wrapper: add missing gstreamer plugins

These GStreamer plugins are required for H264 <video> tag support in Firefox.
firefox-wrapper: use gstreamer hook
Add eid-mw: authenticate & sign with Belgian eID identity cards
Update obtaining.xml

Avoid pointing to the wiki for the default installation method (which points back to the manual anyway). Use more words.
chromium: enable cups by default
haskell-hackage-db: update to version 1.9
ingen: update from 5464 to 5490, use default boost, wrap python scripts
hidapi: update/fix description

Description should start with capital letter.
hidapi: add a comment on the license

hidapi allows the user to chose between GPLv3, BSD or HIDAPI license
(more liberal).
haskell-hackage-db: update to version 1.9.1
Fix spdx syntax for GPL1
Allow eudev to find blkid
Update Powertop: 2.6.1 -> 2.7
Merge pull request #5251 from ts468/powertop

Update Powertop: 2.6.1 -> 2.7
firefox-wrapper: add gstreamer plugins for h264 video support

These plugins are required by firefox for the h264 support in HTML5 <video> tags.
installer tests: don't rely on swap.target until systemd bug is fixed
nixos/systemd: ignore null environment options
nixos: add fleet module
k2pdfopt: update and fix build
Add the Dina font