A way to define a generic kotlin lce.

LceGeneric.kt

sealed class Lce<T> {
    class Loading<T> : Lce<T>() // Can't be an object since it wouldn't have the T otherwise.
    data class Content<T>(val data : T) : Lce<T>()
    data class Error<T>(val error : Throwable) : Lce<T>()
}