[k-9-mail] MVVM architecture and Kotlin

[Mark Anderson]

Apparently more recent versions of K9 are using in areas MVVM architecture
and Kotlin.

A number of specific mods have been made to an older version of K9 for me.
I have been told that considering the MVVM and Kotlin release and the fact
that mods made previously have a number of cyclic dependencies and static
declarations for life-cycle components, it is very difficult to move my
mods to the newer version of K9.

a) could someone tell me please at what release version was the MVVM /
Kotlin architecture was introduced

b) is it indeed a big job / complicated to move the aforementioned style
processes to the latest version (not knowing what these are I understand a
moot question in some respects however at a conceptual level please)

cheers