remove atx-agent

[codeskyblue]

since atx-agent is not very necessary, after remove atx-agent, this repo is very easy to maintain

[codecov]

Codecov Report

Attention: Patch coverage is 31.26437% with 299 lines in your changes are missing coverage. Please review.

Project coverage is 24.47%. Comparing base (0108c92) to head (6dabbde).
Report is 1 commits behind head on master.

Files	Patch %	Lines
uiautomator2/core.py	21.55%	170 Missing and 1 partial ⚠️
uiautomator2/__init__.py	34.28%	92 Missing ⚠️
uiautomator2/__main__.py	0.00%	34 Missing ⚠️
uiautomator2/utils.py	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #959      +/-   ##
==========================================
+ Coverage   19.20%   24.47%   +5.26%     
==========================================
  Files          22       19       -3     
  Lines        3738     2783     -955     
  Branches      614      422     -192     
==========================================
- Hits          718      681      -37     
+ Misses       2995     2077     -918     
  Partials       25       25              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[aliencaocao]

Does this remove any functionality or is it just not used at all?

[codeskyblue]

@aliencaocao https://github.com/openatx/uiautomator2/blob/master/docs/2to3.md