better finding by regexp and some keys work in insert mode

• FindMode: better support for regexp queries, like matching \ra(?!nd) in abc and def
• mapped long keys ending with :i always work in a plain insert mode
  • for example, map <c-j:i> editText run="auto,forward,line" will move caret down by a line, only in insert mode
  • not in any global insert mode of enterInsertMode
• fix it could not enter VisualMode if FindMode had never been activated
• LinkHints: a new option newtab=last-window to open links in the other window
• a new command toggleStyle to insert/remove CSS styles to pages
• a new command scrollSelect to switch selection in <select> boxes
• editText: support a new action of "auto", to switch in extend and move according to selection type
• enterInsertMode: support 2 new options of unhover and reset to clear old modes