Test macros 2.13x3 cross compilation

[MateuszKubuszok]

TODO:

• update build
  • test locally that artifacts are not broken
• define 2.13 and 3 test cases
  • case classes
  • case classes with @BeanProperty
  • classes with default values in constructor
  • enums with parameters in any value
  • enums without parameters in any value
  • sealed traits
• tests 2.13 converting 3 classes and vice versa
  • case classes
  • @BeanProperties as source/target
  • sealed traits to/from enums
  • default values in target type
• documentation - describe what is possible and what isn't

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.34%. Comparing base (d36030c) to head (d509669).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #475      +/-   ##
==========================================
+ Coverage   89.98%   90.34%   +0.35%     
==========================================
  Files         124       99      -25     
  Lines        4554     2340    -2214     
  Branches      359      191     -168     
==========================================
- Hits         4098     2114    -1984     
+ Misses        456      226     -230     

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[MateuszKubuszok]

Well, it seems even with workarounds "sbt sandwich" still ends up with a broken classpath. :/

[MateuszKubuszok]

Without sbt/sbt#7405 this approach would not work.

[MateuszKubuszok]

Replaced by #647