Kotlin statics and static extensions

[elizarov]

This is the initial proposal for Kotlin statics and static extensions

[valery1707]

Missing character ` in heading of last table:

• Actual:

  | Alternative  | Scheme                  | `Color.background` on JVM | Color.parse` on JVM | `Box.of` on JVM |
  

• Fixed:

  | Alternative  | Scheme                  | `Color.background` on JVM | `Color.parse` on JVM | `Box.of` on JVM |
  

[serras]

This proposal is closed in favor of #425