#66 Add inflection group to word form

[highsource]

See #66.

This is a WIP PR, please do not merge yet.

[codecov-io]

Codecov Report

Merging #67 into master will increase coverage by 0.05%. The diff coverage is 100%.

@@             Coverage Diff              @@
##             master      #67      +/-   ##
============================================
+ Coverage     76.52%   76.57%   +0.05%     
+ Complexity     1352     1350       -2     
============================================
  Files           117      117              
  Lines          4749     4760      +11     
  Branches        798      799       +1     
============================================
+ Hits           3634     3645      +11     
  Misses          902      902              
  Partials        213      213

Impacted Files	Coverage Δ	Complexity Δ
...mstadt/ukp/jwktl/api/entry/WiktionaryWordForm.java	94.73% <100%> (+0.61%)	22 <3> (+1)	:arrow_up:
...parser/de/components/nountable/EinzahlHandler.java	100% <100%> (ø)	3 <0> (ø)	:arrow_down:
...arser/de/components/nountable/SingularHandler.java	100% <100%> (ø)	4 <0> (ø)	:arrow_down:
.../parser/de/components/nountable/PluralHandler.java	100% <100%> (ø)	2 <0> (ø)	:arrow_down:
...nountable/PatternBasedIndexedParameterHandler.java	94.11% <100%> (+4.11%)	4 <0> (+1)	:arrow_up:
...mponents/nountable/DEWordFormNounTableHandler.java	92.85% <100%> (-1.59%)	7 <3> (-4)
...arser/de/components/nountable/MehrzahlHandler.java	100% <100%> (ø)	2 <0> (ø)	:arrow_down:

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[highsource]

This is done and could (theoretically) be merged. But it depends on #65, so we have to review/fix/merge that one first - and probably this PR will be influenced by that as well.