D26841: hardware tool: define syntax via syntax arg

[Harald Sitter]

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REVISION SUMMARY
  this way the commands syntax is always immediately visible
  in the help text.
  nothing infurates me more than help that doesn't help, and
  previously the help would essentially just end up telling you to
  run --commands to actually get help -.-
  
  the existing syntax argument of addPositionArgument will simply
  print the syntax help undearneath the usage line, thus giving
  immediate access to information on how to use the application
  without first having to go through the --commands argument
  
  (--commands still exists for backwards compat)

TEST PLAN
  -h now useful

REPOSITORY
  R245 Solid

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D26841

AFFECTED FILES
  src/tools/solid-hardware/solid-hardware.cpp

To: sitter
Cc: kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns
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