[TASK] Replace "t3-data-type" with "confval"

[brotkrueml]

This is a preparation for switching to PHP-based documentation rendering.

Additionally, index is added for missing data types.

Releases: main, 12.4, 11.5

[github-actions]

The backport to 11.5 failed:

The process '/usr/bin/git' failed with exit code 1

stderr

error: could not apply 0ee76d4... [TASK] Replace "t3-data-type" with "confval"
hint: After resolving the conflicts, mark them with
hint: "git add/rm <pathspec>", then run
hint: "git cherry-pick --continue".
hint: You can instead skip this commit with "git cherry-pick --skip".
hint: To abort and get back to the state before "git cherry-pick",
hint: run "git cherry-pick --abort".

stdout

CONFLICT (modify/delete): Documentation/ContentObjects/Extbaseplugin/Index.rst deleted in HEAD and modified in 0ee76d4 ([TASK] Replace "t3-data-type" with "confval").  Version 0ee76d4 ([TASK] Replace "t3-data-type" with "confval") of Documentation/ContentObjects/Extbaseplugin/Index.rst left in tree.
Auto-merging Documentation/ContentObjects/Hmenu/Categories.rst
Auto-merging Documentation/ContentObjects/Image/Index.rst
Auto-merging Documentation/ContentObjects/UserAndUserInt/Index.rst
Auto-merging Documentation/DataTypes/Index.rst
CONFLICT (content): Merge conflict in Documentation/DataTypes/Index.rst
Auto-merging Documentation/Functions/Cache.rst
CONFLICT (content): Merge conflict in Documentation/Functions/Cache.rst
Auto-merging Documentation/Functions/Data.rst
Auto-merging Documentation/Functions/Encapslines.rst
CONFLICT (content): Merge conflict in Documentation/Functions/Encapslines.rst
Auto-merging Documentation/Functions/Htmlparser.rst
CONFLICT (content): Merge conflict in Documentation/Functions/Htmlparser.rst
Auto-merging Documentation/Functions/HtmlparserTags.rst
CONFLICT (content): Merge conflict in Documentation/Functions/HtmlparserTags.rst
Auto-merging Documentation/Functions/If.rst
CONFLICT (content): Merge conflict in Documentation/Functions/If.rst
Auto-merging Documentation/Functions/Imagelinkwrap.rst
CONFLICT (content): Merge conflict in Documentation/Functions/Imagelinkwrap.rst
Auto-merging Documentation/Functions/Imgresource.rst
CONFLICT (content): Merge conflict in Documentation/Functions/Imgresource.rst
Auto-merging Documentation/Functions/Makelinks.rst
CONFLICT (content): Merge conflict in Documentation/Functions/Makelinks.rst
Auto-merging Documentation/Functions/Numberformat.rst
CONFLICT (content): Merge conflict in Documentation/Functions/Numberformat.rst
Auto-merging Documentation/Functions/Parsefunc.rst
CONFLICT (content): Merge conflict in Documentation/Functions/Parsefunc.rst
Auto-merging Documentation/Functions/Replacement.rst
CONFLICT (content): Merge conflict in Documentation/Functions/Replacement.rst
Auto-merging Documentation/Functions/Round.rst
CONFLICT (content): Merge conflict in Documentation/Functions/Round.rst
Auto-merging Documentation/Functions/Select.rst
CONFLICT (content): Merge conflict in Documentation/Functions/Select.rst
Auto-merging Documentation/Functions/Split.rst
CONFLICT (content): Merge conflict in Documentation/Functions/Split.rst
Auto-merging Documentation/Functions/Stdwrap.rst
CONFLICT (content): Merge conflict in Documentation/Functions/Stdwrap.rst
Auto-merging Documentation/Functions/Strpad.rst
CONFLICT (content): Merge conflict in Documentation/Functions/Strpad.rst
Auto-merging Documentation/Functions/Tags.rst
CONFLICT (content): Merge conflict in Documentation/Functions/Tags.rst
Auto-merging Documentation/Functions/Typolink.rst
CONFLICT (content): Merge conflict in Documentation/Functions/Typolink.rst
Auto-merging Documentation/Gifbuilder/Properties.rst
Auto-merging Documentation/Settings.cfg
Auto-merging Documentation/Setup/Config/Index.rst
CONFLICT (content): Merge conflict in Documentation/Setup/Config/Index.rst
Auto-merging Documentation/Setup/Page/Index.rst
Auto-merging Documentation/TopLevelObjects/Plugin.rst
CONFLICT (content): Merge conflict in Documentation/TopLevelObjects/Plugin.rst
Auto-merging Documentation/UsingSetting/Constants.rst

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-11.5 11.5
# Navigate to the new working tree
cd .worktrees/backport-11.5
# Create a new branch
git switch --create backport-929-to-11.5
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick 0ee76d4f6d6d6ae5b7fdfdf8855864d5decb673f
# Push it to GitHub
git push --set-upstream origin backport-929-to-11.5
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-11.5

Then, create a pull request where the base branch is 11.5 and the compare/head branch is backport-929-to-11.5.