R4R: Remove AppInit

[alessio]

Picking #2675 up from where @jaekwon left it.

Code cleanup, AppInit is no longer required.

• Linked to github-issue with discussion and accepted design OR link to spec that describes this work.
• Wrote tests
• Updated relevant documentation (docs/)
• Added entries in PENDING.md with issue #
• rereviewed Files changed in the github PR explorer

---

For Admin Use:

• Added appropriate labels to PR (ex. wip, ready-for-review, docs)
• Reviewers Assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[codecov]

Codecov Report

Merging #2801 into develop will not change coverage.
The diff coverage is 50%.

@@           Coverage Diff            @@
##           develop    #2801   +/-   ##
========================================
  Coverage    56.73%   56.73%           
========================================
  Files          131      131           
  Lines         8554     8554           
========================================
  Hits          4853     4853           
  Misses        3368     3368           
  Partials       333      333

[jackzampolin]

One small note here, I think this is getting moved in the docs update. I have a feeling that is going to merge first, so this will be a merge conflict.

[jackzampolin]

Looks good and doesn't break anything when I run locally. Can you provide a bit more info on why this change was made and if there are any user facing side effects?

[alessio]

@jackzampolin Code cleanup, AppInit is no longer required. Updated description.

[alexanderbez]

Yeah changes LGTM mostly. Can you resolve the doc merge conflicts? Then should be g2g.