Merge branch 'master' into pageattributes

Adjusted some more files to account for changes in the over 100 commits
in master since the creation of this branch.

SPR-869

Do not show a tab if the content is falsy

There may be occasions where plugin does not wish to show any output for
the current user/page. In that case the tab should not be shown at all.

SPR-895

give tabs a class for special styling

I nearly needed that but then didn't. but it might come in handy

avoid empty ul

An empty UL is not valid in HTML, but since we don't know if LIs are
added later on by JavaScript, we add an invisible LI by default now.

moved tab logic to a new class

More of the logic should be moved to this class

fixed missing closing a tag

moved tab generation to PHP, no empty tabs SPR-799

I still don't like the code directly in the template there. I think it
should be moved to a helper class.

The TOC CSS seems to be broken when ther

moved tab generation to PHP, no empty tabs SPR-799

I still don't like the code directly in the template there. I think it
should be moved to a helper class.

The TOC CSS seems to be broken when there are no tabs right of the TOC.

show more ...

SPR-797 fix ID uniqueness

As explained on https://www.dokuwiki.org/devel:javascript#using_ids IDs
may not clash with headlines. To avoid that all IDs have to use two
subsequent underscores.

fix name of toc tab

font-size des root reduziert, damit default font size 1rem entspricht

Vorbereitung sprint meeting

metabox part 3

metabox part 2

metabox part 1