Apply regular expression on richeditor to cleanup content

[didoda]

This provides a way to apply a regular expression on richeditor change, if set in configuration.
Example:

'Richeditor' => [
    'cleanup_regex_pattern' => '\\sstyle="[^"]*"', // remove style attributes from tags
    'cleanup_regex_argument' => 'gs', // global and match new lines
    'cleanup_regex_replace' => '', // replace with empty string
],

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (3708ec2) to head (bf67945).
Report is 21 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##              master     #1271   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
- Complexity      1384      1391    +7     
===========================================
  Files             98        98           
  Lines           5493      5543   +50     
===========================================
+ Hits            5493      5543   +50     

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