Proper presentations with stepping

Proper presentations with stepping

[Thomas Welter]

The presentation examples with stepping always seem to lack page and section numbers because \incrementcounter gets fired on every stepping iteration. For that I adjusted a few lines in spresent-steps.mkiv. You can see an (scientifically-styled) example presentation here: https://github.com/WelterDevelopment/present-steps-context

Also I would like to propagate the idea of removing the sectioning heads from the page content and move them to the page header. This does simplify a lot of issues in (non-javascript) stepped presentations:
\setuphead[section,subsection][page=yes, placehead=empty]
\setupheadertexts[{\getmarking[sectionnumber] \getmarking[section] -- \getmarking[subsectionnumber] \getmarking[subsection]}][]

Maybe something like this can be added as a new example presentation in texmf-context\doc\context\presentations\examples because the current present-steps-001 is a little too minimal.

If you have any ideas to automate the prevention of auto-incrementing the counters for floats and equations, please don't hesitate to commit changes.

Kind regards,
Thomas
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