WIP: Macro that generates companion for refined types

[fthomas]

This is the second draft of a macro for #342 and still WIP.

[codecov]

Codecov Report

Merging #346 into master will decrease coverage by 3.73%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #346      +/-   ##
==========================================
- Coverage   98.71%   94.97%   -3.74%     
==========================================
  Files          39       40       +1     
  Lines         468      478      +10     
  Branches        8        8              
==========================================
- Hits          462      454       -8     
- Misses          6       24      +18

Impacted Files	Coverage Δ
...src/main/scala/eu/timepit/refined/types/char.scala	0% <0%> (ø)
.../main/scala/eu/timepit/refined/types/numeric.scala	0% <0%> (ø)
.../src/main/scala/eu/timepit/refined/types/net.scala	0% <0%> (ø)
...c/main/scala/eu/timepit/refined/types/string.scala	0% <0%> (ø)
...ala-2.13.0-M2/eu/timepit/refined/api/Refined.scala	75% <0%> (-13.89%)	⬇️
...hared/src/main/scala/eu/timepit/refined/eval.scala	100% <0%> (ø)	⬆️
.../scala/eu/timepit/refined/macros/RefineMacro.scala	100% <0%> (ø)	⬆️
...in/scala-2.11/eu/timepit/refined/api/Refined.scala
...in/scala-2.10/eu/timepit/refined/api/Refined.scala
...n/scala/eu/timepit/refined/macros/InferMacro.scala
... and 4 more

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[fthomas]

The current implementation works with 2.12 but not with 2.10 and 2.11. And unfortunately both fail in different ways and I've no idea how to fix them.

[fthomas]

Closing in favor of #369.