• history completer: fix some old items are skipped in prefix matching mode
• Commands: add option $if={"sys":"win","browser":1}/... to filter mappings
  • "sys" can be "win", "mac" or "linux"
  • "browser" can be 1 (Chrome) | 2 (Firefox) | 4 (EdgeHTML)
• now most commands support shortcuts well
• "dark" in vomnibarOptions now overrides the status of autoDarkMode
• in dark mode, use pure black as the background color
• some other bug fixes