Align Patcher DSL implementation with Transformers

[MateuszKubuszok]

Any attempt to align Patchers with Transformers would inevitably break backward in classes definitions:

• separating flags from configs would require renaming classes (what currently is called PatcherCfg is in fact counterpart to TransformerFlags without disabling)
• providing flags through implicits would require additional (implicit) argument in .patch
• adding overrides would require adding new methods and type parameters

Since branch 0.8.0 is not yet stabilized we are at luxury of breaking this - users who only update "stable" versions (with the early semver understanding of the word) would face only one such breaking change as opposed to several in the coming months if we would plan ahead these breaking changes and release them only once before some final API cleanup.

TODO:

• update DSL:
  • split PatcherCfg from PatcherFlags
  • after Cfg <: PatcherCfg add Flags <: PatcherFlags
  • rename FlagsDsl to TransformerFlagsDsl, extract PatcherFlagsDsl
  • create PatcherConfiguration
  • add new implicit PatcherConfiguration[ImplicitScopeFlags <: PatcherFlags]
• update macros:
  • parse new versions of PatcherCfg and PatcherFlags into config
  • start using ImplicitScopeFlags <: PatcherFlags
• add missing functionality
  • create Patcher.AutoDerived to align with Transformers
  • introduce Patcher.derive and Patcher.define
• update tests:
  • test that implicit cfg enables flags and that this can be overriden in instance flags

[codecov]

Codecov Report

Patch coverage: 76.78% and project coverage change: +0.28% 🎉

Comparison is base (488f453) 79.02% compared to head (f956643) 79.31%.

❗ Current head f956643 differs from pull request most recent head 3b40689. Consider uploading reports for the commit 3b40689 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #355      +/-   ##
==========================================
+ Coverage   79.02%   79.31%   +0.28%     
==========================================
  Files         105      107       +2     
  Lines        4020     4060      +40     
  Branches      191      139      -52     
==========================================
+ Hits         3177     3220      +43     
+ Misses        843      840       -3     

Files Changed	Coverage Δ
...and/chimney/dsl/PartialTransformerDefinition.scala	66.66% <ø> (ø)
...scalaland/chimney/dsl/PartialTransformerInto.scala	66.66% <ø> (ø)
.../scalaland/chimney/dsl/TransformerDefinition.scala	83.33% <ø> (ø)
...a-2/io/scalaland/chimney/dsl/TransformerInto.scala	83.33% <ø> (ø)
...and/chimney/dsl/PartialTransformerDefinition.scala	50.00% <ø> (ø)
...scalaland/chimney/dsl/PartialTransformerInto.scala	50.00% <ø> (ø)
.../scalaland/chimney/dsl/TransformerDefinition.scala	75.00% <ø> (ø)
...a-3/io/scalaland/chimney/dsl/TransformerInto.scala	75.00% <ø> (ø)
...rnal/compiletime/dsl/PatcherDefinitionMacros.scala	0.00% <0.00%> (ø)
.../src/main/scala/io/scalaland/chimney/Patcher.scala	0.00% <0.00%> (ø)
... and 16 more

... and 9 files with indirect coverage changes

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