Add UndocumentedPublicProperty rule - closes #1670

[schalkms]

No description provided.

[arturbosch]

Unfortunately I messed it up with the GitHub gui to fix the conflicts :(

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@4e9dc71). Click here to learn what that means.
The diff coverage is 92.3%.

@@            Coverage Diff            @@
##             master    #1923   +/-   ##
=========================================
  Coverage          ?   80.71%           
  Complexity        ?     1988           
=========================================
  Files             ?      330           
  Lines             ?     5585           
  Branches          ?     1020           
=========================================
  Hits              ?     4508           
  Misses            ?      538           
  Partials          ?      539

Impacted Files	Coverage Δ	Complexity Δ
...turbosch/detekt/rules/documentation/CommentUtil.kt	100% <ø> (ø)	0 <0> (?)
.../rules/documentation/UndocumentedPublicFunction.kt	77.77% <100%> (ø)	9 <0> (?)
...sch/detekt/rules/providers/CommentSmellProvider.kt	100% <100%> (ø)	3 <0> (?)
.../rules/documentation/UndocumentedPublicProperty.kt	87.5% <87.5%> (ø)	10 <10> (?)

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