Enhanced Kotlin Support

[stachu540]

Prerequisites

• This issue specifically has something to do with this library
• I have attempted to look for similar issues already
• I have read and understood the contribution guidelines and I accept them.

Description

Fully change supports via Koltin. In #29 supports only partial and only data classes, now we are planning merge to full support into Kotlin with merging into Coroutines.

Steps to Reproduce

1. Refactor and enhance all subject classes into Koltin
2. Pulling them into Replace Reactive Streams to RxJava #35

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Expected behavior:
All subjects are be Kotlin
Actual behavior:
All subjects are partial Kotlin/Java
Stacktrace (if applicable):
Stacktrace handled by Reactive Streams
Version affected:
v0.7.+

Additional Information

NONE