Migrate from versioneer to versioningit

[eirrgang]

Follow-up to #150

• Use a PEP-517-only build.
• Remove setup.py since it is no longer necessary.

Ref #149

[codecov[bot]]

Codecov Report

Merging #151 (e1e1f4a) into master (1618695) will decrease coverage by 17.09%. The diff coverage is n/a.

@@             Coverage Diff             @@
##           master     #151       +/-   ##
===========================================
- Coverage   61.53%   44.44%   -17.10%     
===========================================
  Files          12       12               
  Lines          78       54       -24     
===========================================
- Hits           48       24       -24     
  Misses         30       30               

Flag	Coverage Δ
unittests	44.44% <ø> (-17.10%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
prj_1_1_1/prj_1_1_1/__init__.py	100.00% <0.00%> (ø)
prj_1_1_2/prj_1_1_2/__init__.py	100.00% <0.00%> (ø)
prj_1_2_1/prj_1_2_1/__init__.py	100.00% <0.00%> (ø)
prj_1_2_2/prj_1_2_2/__init__.py	100.00% <0.00%> (ø)
prj_1_3_1/prj_1_3_1/__init__.py	100.00% <0.00%> (ø)
prj_1_3_2/prj_1_3_2/__init__.py	100.00% <0.00%> (ø)

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[lgtm-com[bot]]

This pull request fixes 2 alerts when merging e1e1f4a97e2824456854af5628615931bba9933b into 51c8757345851d032d40a29dac64df0b2f83b66d - view on LGTM.com

fixed alerts:

• 1 for Except block handles 'BaseException'
• 1 for Suspicious unused loop iteration variable

[Lnaden]

Adding extra note that this removes versioneer in place of versioningit