Coding standard 2.0.0

[phil-davis]

like done in core owncloud/core#36580

and apply latest drone starlark code changes
Note: there was no effect here on .drone.yml

Note: there were no changes to PHP code needed for this app to pass code-style 2.0.0

[codecov]

Codecov Report

Merging #157 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #157   +/-   ##
=========================================
  Coverage     64.14%   64.14%           
  Complexity       31       31           
=========================================
  Files             7        7           
  Lines           198      198           
=========================================
  Hits            127      127           
  Misses           71       71

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