Merge PR #4691: Add baseapp concept doc

* consolidate intro

* start anatomy of sdk app

* wokring

* working

* querier

* working

* workiiiing

* finish

* add dep and makefile

* Apply suggestions from code review

Co-Authored-By: Alessio Treglia <quadrispro@ubuntu.com>

* typo

* typo

* Apply suggestions from code review

Co-Authored-By: Alexander Bezobchuk <alexanderbez@users.noreply.github.com>
Co-Authored-By: Federico Kunze <31522760+fedekunze@users.noreply.github.com>
Co-Authored-By: Alessio Treglia <quadrispro@ubuntu.com>
Co-Authored-By: frog power 4000 <rigel.rozanski@gmail.com>

* refactor for new module interface

* karoly review

* Apply suggestions from code review

Co-Authored-By: Karoly Albert Szabo <szabo.karoly.a@gmail.com>
Co-Authored-By: Federico Kunze <31522760+fedekunze@users.noreply.github.com>

* encoding

* working on baseapp doc

* baseapp work

* reorg

* almost there

* finish first draft

* remove old files

* hans review'

* jack review + clarification on ABCI methods

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