v3dv: start using output control hooks

* for config file, document headers, & command line
* v3dv: sysenv, ProcessingSettings, start to use hooks to make it possible
  to control (via: the command line; the document markup header, or; the
  configuration file) the likes of: ocn, toc, segsubtoc, minitoc,
  links-to-manifest, search-form, html-navigation, html-navigation-bar,
  html-right-pane, html-top-band; these are switched on by default and may
  be switched off in omit lists within configuration file, the document
  markup header, or command line. The command line takes precedence & may
  switch on or off overriding settings within the document markup header or
  the sisu configuration file.
  * --inc- on by default, but if switched off in doc header or
    configuration, the command line --inc- has precedence; for each possible
    exclude configuration the --inc- switch that overrides configuration
    settings
  * --exc- == --no-; exclude/switch off feature (but --inc- include has
    precedence)
  * document header @build: :omit: [list output features to be omitted]
  * configuration (sisurc.yml) omit:
  exclude output feature, overrides configuration settings (omit --dev
  development branch modifier once merged back to main)
   --exc-ocn,                 html (seg, scroll), epub, xml, pdf
     sisu --dev --exc-ocn --html --epub --xml-sax --xml-dom --xhtml -v \
     filename.sst
   --exc-toc,                 html (scroll), epub, pdf
     sisu --dev --exc-toc --html --epub --pdf -v filename.sst
   --exc-segsubtoc            html (seg), epub
     sisu --dev --exc-segsubtoc --html --epub -v filename.sst
   --exc-minitoc,             html (seg), concordance, manifest
     sisu --dev --exc-minitoc --html --concordance -v filename.sst
   --exc-manifest-minitoc,    manifest
     sisu --dev --exc-manifest-minitoc --html -v filename.sst
   --exc-links_to_manifest, --exc-manifest-links,
                              html (seg, scroll)
     sisu --dev --exc-manifest-links --html -v filename.sst
   --exc-search-form,         html (seg, scroll), manifest
     sisu --dev --exc-search-form --html -v filename.sst
   --exc-html-minitoc,        html (seg), concordance
     sisu --dev --exc-html-minitoc --html --concordance -v filename.sst
   --exc-html-navigation,     html (seg, scroll)?
     sisu --dev --exc-html-navigation --html -v filename.sst
   --exc-html-navigation-bar, html (seg)
     sisu --dev --exc-html-navigation-bar --html -v filename.sst
   --exc-html-search-form,    html (seg, scroll)
     sisu --dev --exc-html-search-form --html -v filename.sst
   --exc-html-right-pane,     html (seg, scroll)
     sisu --dev --exc-html-right-pane --html -v filename.sst
   --exc-html-top-band,       html (seg, scroll), concordance (minitoc is
     forced on to provide seg navigation)
     sisu --dev --exc-html-top-band --html --concordance -v filename.sst

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