Release v0.2.12

Technical release with refactoring, new fundamental logic and library migrations

Main functional features

• Add date-time handling
• Support unicode symbols in strings
• Supporting the decoding of value (inline) classes
• Partial support for custom serializers
• Handle commas in string for arrays.

Main technical features

• Kotlin updated to 1.6.21
• New configuration mechanism introduced instead of TomlConfig (it's now deprecated)
• New fundamentals for serialization logic were added. Encoding will be introduced in future releases

@bishiboosh @akuleshov7 @NightEule5 thank you for this outstanding contribution!