[Doxygen] More extra-pages for cards/developer documentation and various fixes (#6316)

* Docu stash

Took 1 hour 53 minutes

Took 5 minutes


Took 16 seconds

Took 33 seconds

* Remove file headers.

Took 8 minutes

* Group to card set.

Took 8 seconds

* More extra pages.

Took 28 seconds

* Small fix for now.

Took 3 minutes

* Expand on picture loading.

Took 44 minutes

* Fix line break breaking link.

Took 2 minutes

* Images and user documentation.

Took 1 hour 49 minutes

* Update doc/doxygen-extra-pages/developer_documentation/primer_cards.md

Co-authored-by: RickyRister <42636155+RickyRister@users.noreply.github.com>

---------

Co-authored-by: Lukas Brübach <Bruebach.Lukas@bdosecurity.de>
Co-authored-by: RickyRister <42636155+RickyRister@users.noreply.github.com>

doc/doxygen-extra-pages/user_documentation/deck_management/importing_decks.md

@@ -0,0 +1,62 @@
+@page importing_decks Importing Decks
+
+# Where to import?
+
+There are three screens in the client which can be used to import decks, depending on the context.
+
+- The deck editor tab
+- The pre-game lobby tab
+- The deck storage tab (not to be confused with the visual deck storage tab)
+
+# The Deck Editor Tab
+
+The deck editor tabs (Classic and Visual) offer three ways of importing a deck:
+
+- From a file on your local storage
+- From your clipboard
+- From an online service
+
+## Local File Storage
+
+To load a deck from a file on your local storage, select the "Load Deck" action in the "Deck Editor" or "Visual Deck
+Editor" menu in the application menu bar at the top of the screen. Alternatively, you can use the shortcut Ctrl/Cmd + O
+to access this action.
+
+Selecting this action will open a file picker dialog provided by your operating system. Simply select a supported file
+here and it will be loaded.
+
+Just below the "Load Deck" action described above is the "Load recent deck" option, which keeps a record of the last 10
+loaded decks for quick access.
+
+## From Clipboard
+
+To load a deck from your clipboard, select the "Load deck from clipboard..." action in the "Deck Editor" or "Visual Deck
+Editor" menu in the application menu bar at the top of the screen. Alternatively, you can use the shortcut Ctrl/Cmd +
+Shift + V to access this action.
+
+Selecting this action will open a new text editor dialog with the contents of your clipboard pasted inside it.
+
+The import dialog expects each line to be a card with the following format:
+
+TODO
+
+Each card should be on a separate line and there should be no empty lines between cards. The first empty line between
+two blocks of cards will be considered as the divider between mainboard and sideboard.
+
+Selecting "Parse Set Name and Number (if available)" will automatically parse these options and attempt to resolve them
+to valid provider IDs found in the card database. If this option is unselected, Cockatrice will import all cards as
+versions without provider IDs, which means they will display to everyone according to their own user defined set
+preferences, rather than being the same defined printing for everyone.
+
+## From an online service
+
+To load a deck from an online service, select the "Load deck from online service..." action in the "Deck Editor" or "
+Visual Deck Editor" menu in the application menu bar at the top of the screen.
+
+Selecting this action will open a dialog containing the contents of your clipboard pasted into it. If your clipboard
+currently contains a supported URL, the dialog will accept it and close on its own, otherwise you may adjust the URL and
+confirm.
+
+The action will automatically import the deck from the online service without any other required user action.
+
+Currently supported services are Archidekt, Deckstats, Moxfield, and TappedOut.