refuse to open known "harmful" URLs

1.88.2

• refuse to open known "harmful" URLs and show a tip: for example, the ...\condrv\kernelconnect will trigger an error
• key mappings: env: add fullscreen: boolean to detect element-wise fullscreen mode
• LinkHints.click: add direct="element" match=... index=<number>|"count" to directly select any element and click
• Scroller: support keepHover=true|"auto"|false|"never"|<number>
  • "auto" to detect 3 times of losing frames (interval > 20ms) and then prevent hover effects
  • false means to prevent by default, unless there's selected text; never means to ignore selection status
  • <number> means a minimum latency for "auto", if it >= 20
• Scroller: fix broken scrollPx* and some other issues
• Vomnibar: if in domain mode (query starts with :d ), then show a list of matched domains
• Vomnibar: fix an order bug on pagedown
• goNext: prefer the value of [aria-label] if text is very short (up to 2 characters, like icons)
• improved vimium://show #!image