Update man page for 1.0

The man page needs to be updated for Inkscape 1.0

(list by @Moini, moved from https://bugs.launchpad.net/inkscape-docs/+bug/1778078)

• Inkscape can now import a specific page of a PDF file from the command line, for batch processing (new option: --pdf-page N)
  inkscape/inkscape@045470cc
• Additionally, the verbs syntax has changed. Not sure if both options are now there, or if some things are available as verbs and some as actions... No feedback from Tav, I asked a couple of times.
• --pdf-poppler Use poppler when importing via commandline
• --pipe (or -p) argument (see comment and inkscape/inkscape@465a6750...b2294c56
• changed behavior of how to pass in verbs (as semicolon-separated list now)
• exporting multiple file formats at once

Missing from both 0.92.x and master branches (list by @Moini, moved from https://bugs.launchpad.net/inkscape-docs/+bug/1810570)

• --export-margin option missing:
  https://gitlab.com/inkscape/inkscape/blob/0.92.x/src/main.cpp#L356
• --export-wmf and export-emf options missing:
  https://gitlab.com/inkscape/inkscape/blob/0.92.x/src/main.cpp#L440
• --convert-dpi-method
  https://gitlab.com/inkscape/inkscape/blob/0.92.x/src/main.cpp#L542
• And I just saw that piping could be used before, for output:
  https://gitlab.com/inkscape/inkscape-docs/documentation/blob/0.92.x/man/inkscape.pod.in#L245
  (but it was more complicated)

Compared man SYNOPSIS and OPTIONS (@gyuris)

• delete --export-png option
  Someone deleted this option from the SYNOPSIS correctly, but continues to occur in OPTIONS (2×) and in EXAMPLES (6×).
• add --export-ps-level option
  This option is present in the SYNOPSIS but description is missing from OPTIONS. It's an alive option: https://gitlab.com/inkscape/inkscape/blob/master/src/inkscape-application.cpp#L569

Compared man to inkscape-application.cpp (@gyuris)

• rename --export-filename to --export-file
  https://gitlab.com/inkscape/inkscape/blob/master/src/inkscape-application.cpp#L549
• modify --select to comma separated list
  https://gitlab.com/inkscape/inkscape/blob/master/src/inkscape-application.cpp#L590
• add --export-overwrite option
  https://gitlab.com/inkscape/inkscape/blob/master/src/inkscape-application.cpp#L550
• add --actions option
  https://gitlab.com/inkscape/inkscape/blob/master/src/inkscape-application.cpp#L594
• add --batch-process option
  https://gitlab.com/inkscape/inkscape/blob/master/src/inkscape-application.cpp#L606
• add --dbus-listen and --dbus-name option
  https://gitlab.com/inkscape/inkscape/blob/master/src/inkscape-application.cpp#L612 https://gitlab.com/inkscape/inkscape/blob/0.92.x/src/main.cpp#L506 (who can use these? Is it compiled with dbus by default? What does this actually do?) Separated to #31 (closed)
• delete old export options: --export-emf, --export-wmf, --export-ps, --export-eps, --export-pdf
  See --export-type=FILE_TYPE
• reorganize order to inkscape-application.cpp

New tasks (@gyuris)

• delete --g-fatal-warnings
  According to #2 (comment 264067613)
• modify --export-id=ID[;ID] and --query-id=ID[,ID]
  https://gitlab.com/inkscape/inkscape/blob/master/src/inkscape-application.cpp#L566 https://wiki.inkscape.org/wiki/index.php/Using_the_Command_Line