Added an ID to config manager form

Fix regression in third-party JSON utility

Goal is to make it easy to create an alternate "save" button with a 'form' attribute pointing to that ID, be it in pagetools or anywhere else (related to https://github.com/splitbrain/dokuwiki/issues/764)

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Pr/2675

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conf: remoteuser doc improvement

unify send_redirect(wl()) parameters

Upped copyright year to 2019 in README

Bump up copyright year

Set User-Agent header to 'DokuWiki HTTP Client (Extension Manager)'

Added rounds support for sha512

don't show empty optiongroup item in Mobilemenu

fix ACL admin footnote JS error

- ACL's hand-written template doesn't use div.content to wrap the footnote content
- jQuery object existence check should use $obj.length

Fix zero width spaces in diffs

Co-authored-by: eiroca <eiroca@users.noreply.github.com>

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