Split highlighted words with flexsearch delimiter

[lukaw3d]

Flexsearch's split defaults to /[\W_]+/, not " ": https://github.com/nextapps-de/flexsearch#charset-options

Quick comparison of searching for code	Before	After	After (without spaces)

• Before:

  configuration to keep this behaviour:

  splitHighlightedWords: ' ',
  /*noExtraSpaceAfterHtmlTag: false,  // default */

• After:

  this is new default

  /*splitHighlightedWords: null,  // default */
  /*noExtraSpaceAfterHtmlTag: false,  // default */

• After (without spaces):

  I didn't make this default because I'm not sure if it concatenates words in any use case. But it works best

  /*splitHighlightedWords: null,  // default */
  noExtraSpaceAfterHtmlTag: true,

[z3by]

Hey, @lukaw3d this branch is conflicted, could you please resolve conflicts.

[lukaw3d]

@z3by :+1: Rebased

[lukaw3d]

@z3by would you mind making a release with this?