Replacing Anko completely from the codebase

[ranaaditya]

Anko was an kotlin library that made android related kotlin work much easier in initial days but kotlin team has decided to deprecated it !

We are using Anko at some places like - readymade toasts, easier async tasks, etc.

Last year we have migrated most of the stuff to kotlin coroutines but still we have anko at few places.

For help you can follow Migration docs

[avikumar15]

Needs more memory leak analysis and testing before we can proceed to merge it into master.

[ranaaditya]

@avikumar15 you can use leak canary for this purpose !