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

* Docu stash

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* Remove file headers.

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* Group to card set.

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* More extra pages.

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* Small fix for now.

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* Expand on picture loading.

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* Images and user documentation.

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* 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/editing_decks_visual.md

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+@page editing_decks_visual Visual Deck Editor
+
+# Editing Basic Deck Information
+
+Editing basic deck information is done through the deck dock widget (DeckEditorDeckDockWidget).
+
+\image html deckeditordeckdockwidget.png
+
+This widget allows editing:
+
+- The name
+- The comments
+- The banner card, which is used to represent the deck in the visual deck storage
+- The tags, which are used for filtering in the visual deck storage
+
+# Adding Cards
+
+Adding cards is done by either using the "Quick search and add card" search bar at the top of the "Visual Deck View" tab
+or by clicking on a picture of a card in the "Visual Database Display" tab.
+
+See @ref visual_database_display for more information on how to utilize the visual database display.
+
+# Modifying the Deck List
+
+To modify or remove cards in the deck list, the tree list view in the deck dock widget can be used.
+
+Just above the list, at the top right, there are four buttons to manipulate the currently selected card(s):
+
+- Increment Card
+- Decrement Card
+- Remove Card
+- Switch Card between Mainboard and Sideboard
+
+Additionally, there is a combo box above the list, which may be used to change how cards are grouped in the list
+display. This is only for visual display and does not affect how the list is saved.
+
+# Modifying the visual deck layout
+
+The visual deck editor displays cards visually, as opposed to simply in list form in the Deck Dock Widget. Each entry in
+the deck list is represented by a picture. These entries are grouped together under their respective sub-groups.
+Sub-groups may be collapsed (i.e. the pictures contained within them are hidden) by clicking on the name of the group in
+the banner.
+
+Cards may either be displayed in a "Flat" layout, which displays each picture next to each other and ensures full
+visibility for each card, or in an "Overlap" layout, which overlaps cards on top of each other (leaving the top 20% of
+the card uncovered so names remain readable) and arranges them in stacks to save space and allow for an easy overview.
+
+Additionally, it is possible to change how the cards in the deck list are grouped by selecting a different grouping
+method from the combo box, either in the top left of the "Visual Deck View" tab or above the list view in the deck dock
+widget.
+
+Furthermore, it is possible to change how the cards are sorted within the sub-group. This is done by clicking on the
+button with the cogwheel icon next to the combo box that adjusts grouping in the top left of the "Visual Deck View" tab.
+This presents a list of available sort criteria, which may be rearranged to change their priorities.
+
+# Modifying printings
+
+For more information on modifying the printings in a deck see @ref editing_decks_printings
+
+# Deck Analytics
+
+The visual deck editor offers a "Deck Analytics" tab, which displays information about:
+
+- The mana curve
+- The mana devotion
+- The mana base
+
+# Sample Hand
+
+The visual deck editor offers a "Sample Hand" tab, which allows simulating drawing a configurable amount of cards from
+the deck, which reduces the need to launch a single player game for testing purposes.