Fix display numeric item icons

- Required for some custom icons
CMenuWidget: Add function getNextShortcut()/setNextShortcut()

  for setting of direktkey in the plugin integration
CMenuWidget::integratePlugins(): Add shortcut parameter
integrated plugins: Add direct keys
Disable infoclock when display current transponder
Enable gradient for all remaining GUI header
Merge remote-tracking branch 'cool-cst-next/cst-next'