Move cleanup logic into Makefile

[kostis]

PR #308 brought up the issue that the clean command of rebar3 had a Unix-based script as a post_hook that could not be run on Windows. Rather that adopting #308 and run the risk of leaving out some OSes, move all cleanup logic, including calling cleanup scripts, to the Makefile instead. This should avoid rebar3 clean crashing on Windows.

While at it, move the rebar3 clean call from the distclean to the clean target of Makefile, which seems more standard.

Closes #308

[codecov-commenter]

Codecov Report

Merging #309 (d6a7353) into master (3de5f72) will increase coverage by 0.10%. The diff coverage is n/a.

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@@            Coverage Diff             @@
##           master     #309      +/-   ##
==========================================
+ Coverage   85.35%   85.46%   +0.10%     
==========================================
  Files          14       14              
  Lines        4590     4590              
==========================================
+ Hits         3918     3923       +5     
+ Misses        672      667       -5     

see 6 files with indirect coverage changes

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