In my humble opinion deprecating tons of API with level `ERROR` between subsequent releases misses t...

# serialization

[Robert Jaros]

In my humble opinion deprecating tons of API with level ERROR between subsequent releases misses the point of the deprecation at all 😉

[sandwwraith]

For most of the deprecated declarations, a ReplaceWith with detailed messages are provided. Of course, we'll add a changelog/migration guide, but for Kotlin 1.4 release