Views/BuddyView: Introduce BuddyView to show Recent PMs and Group PMs.

[amanagr]

[amanagr]

This is a preview of how buddy list looks now. This is mostly functional and is ready for a spin if anyone wants to try. I would love any feedback on this.

I will add tests for this soon and then reorder some of the commits.

[amanagr]

I don't know why the tests are failing for python 3.4 only??

[amanagr]

@neiljp I have added minimal tests for the functions and this could possibly serve as a v1 for BuddyList. Since this PR is already getting too big, I will add some feature improvements I have in mind along with more robust tests in future PRs. Thanks!

[amanagr]

Thanks @neiljp for the review I will get to them by the end of this week as I am busy with exams.

[amanagr]

I have split the commit as you suggested. As for the fixtures, I can curb them down but I feel they can be useful later as they provide the base for all the group_pm and unread_count related fixtures which were previously missing.

[amanagr]

@neiljp is this ready to merge?

[amanagr]

@punchagan @neiljp I have rebased this PR against master. Let me know your views on this.

[codecov[bot]]

Codecov Report

Merging #315 into master will decrease coverage by 1.96%. The diff coverage is 64.81%.

@@            Coverage Diff             @@
##           master     #315      +/-   ##
==========================================
- Coverage   70.38%   68.41%   -1.97%     
==========================================
  Files          12       12              
  Lines        2195     1979     -216     
  Branches      479      440      -39     
==========================================
- Hits         1545     1354     -191     
  Misses        524      524              
+ Partials      126      101      -25

Impacted Files	Coverage Δ
zulipterminal/config/keys.py	100% <ø> (ø)	:arrow_up:
zulipterminal/ui.py	71.87% <0%> (-3.69%)	:arrow_down:
zulipterminal/core.py	49.26% <30%> (-1.21%)	:arrow_down:
zulipterminal/ui_tools/views.py	82.37% <66.07%> (-0.4%)	:arrow_down:
zulipterminal/helper.py	62.75% <66.66%> (-2.81%)	:arrow_down:
zulipterminal/ui_tools/buttons.py	75.22% <85.71%> (-6.3%)	:arrow_down:
zulipterminal/ui_tools/boxes.py	53.63% <0%> (-5.73%)	:arrow_down:
... and 6 more

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[zulipbot]

Heads up @amanagr, we just merged some commits that conflict with the changes your made in this pull request! You can review this repository's recent commits to see where the conflicts occur. Please rebase your feature branch against the upstream/master branch and resolve your pull request's merge conflicts accordingly.