refactor(server): Dropped RegexCustomType in favour of upstream Regex support

[roxspring]

• Bumped config4k to 0.4.1 including built in Regex support.
• Deleted unnecessary RegexCustomType.

Closes #893

[codecov-io]

Codecov Report

Merging #894 into master will increase coverage by 0.03%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #894      +/-   ##
============================================
+ Coverage     84.23%   84.27%   +0.03%     
+ Complexity      885      882       -3     
============================================
  Files           174      173       -1     
  Lines          2684     2678       -6     
  Branches        427      426       -1     
============================================
- Hits           2261     2257       -4     
+ Misses          205      203       -2     
  Partials        218      218

Impacted Files	Coverage Δ	Complexity Δ
...do/zally/configuration/RulesConfigConfiguration.kt	50% <ø> (-16.67%)	2 <0> (ø)

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