LinkHints supports `xy="x,y,scale"`

• FindMode,VisualMode: support mapKey <xxx:f> <v-xxx> (and :v) to trigger commands
• LinkHints,dispatchEvent: support xy="x[,y[,scale]]" and x/y can be "count"
  • "count" will be replaced by count * scale (0.01); an empty value of x / y means 0.5
  • if abs(x) <= 1, x will be rect edge size * x
  • so xy="count" means [count * 0.01, 0.5]
  • also fix selection of target element, and now run rules in order
• fix a bug affecting suggestion order in Vomnibar
• fix logic conflicts in per-mode mapKey
• fix broken prevent browser from caching images, NewTab Url and Vomnibar page
• LinkHints: add .retainInput to reuse old text query when in filter and queue mode
• LinkHints: now simulates contextmenu on button="right"
• support the <contextmenu> key (when a browser supports)
• text substitution: support base64 (as base64-encode), base64-decode, json and json-parse
• Vomnibar: add an option of itemKeyword which works after itemSedKeys
• copyWindowInfo: add type="host"
• fix some found bugs and compatibility issues