Option to always ignore None in patch

[krzemin]

This PR brings flag .ignoreNoneInPatch for patching, requested in #123.

[codecov]

Codecov Report

Merging #131 into master will increase coverage by 0.18%.
The diff coverage is 97.5%.

@@            Coverage Diff             @@
##           master     #131      +/-   ##
==========================================
+ Coverage   95.95%   96.14%   +0.18%     
==========================================
  Files          13       13              
  Lines         495      519      +24     
  Branches       76       71       -5     
==========================================
+ Hits          475      499      +24     
  Misses         20       20

Impacted Files	Coverage Δ
...land/chimney/internal/utils/DerivationGuards.scala	98.36% <100%> (ø)	⬆️
...ala/io/scalaland/chimney/internal/PatcherCfg.scala	100% <100%> (ø)	⬆️
.../scalaland/chimney/internal/dsl/PatcherUsing.scala	100% <100%> (ø)
...mney/src/main/scala/io/scalaland/chimney/dsl.scala	80% <100%> (ø)	⬆️
...nd/chimney/internal/macros/TransformerMacros.scala	95.4% <100%> (ø)	⬆️
...laland/chimney/internal/macros/PatcherMacros.scala	96.66% <96.55%> (+6.66%)	⬆️

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