Write DSL for saving/restoring mutable properties' values

[Miha-x64]

e. g.

val smth: Whatever.() -> Unit = {
    +someStringProp
    +someIntProp
    +someParcelableProp // (?)
}

toParcel(smth)
fromParcel(smth)
toByteArray(smth)
toByteArray(smth)

Persistent ViewModels may be very useful.

[Miha-x64]

Should remove useless Byte and Short bindings.
And, on the other hand, should add some bindings for nullable properties.

[Miha-x64]

Looks like we don't need nullable values since users can't write nullable texts in fields.