generating javadoc using maven plugin

[rupeshA]

@eeverman , please have a look, I have tried hand on https://github.com/eeverman/andhow/issues/218

[codecov[bot]]

Codecov Report

Merging #454 into master will decrease coverage by 1.33%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #454      +/-   ##
==========================================
- Coverage   78.97%   77.63%   -1.34%     
==========================================
  Files         122      119       -3     
  Lines        3781     3533     -248     
  Branches      635      569      -66     
==========================================
- Hits         2986     2743     -243     
+ Misses        612      607       -5     
  Partials      183      183

Impacted Files	Coverage Δ
...va/org/yarnandtail/andhow/NonProductionConfig.java	75% <ø> (ø)	:arrow_up:
...rg/yarnandtail/andhow/AndHowNonProductionUtil.java	73.8% <ø> (ø)	:arrow_up:
...andtail/andhow/compile/AndHowCompileProcessor.java	78.65% <0%> (-12.53%)	:arrow_down:
...va/org/yarnandtail/andhow/compile/CompileUnit.java	67.21% <0%> (-11.68%)	:arrow_down:
...va/org/yarnandtail/andhow/internal/AndHowCore.java	74.75% <0%> (-3.82%)	:arrow_down:
...ndhow/compile/PropertyRegistrarClassGenerator.java	97.43% <0%> (-2.57%)	:arrow_down:
...andtail/andhow/compile/AndHowCompileException.java
...org/yarnandtail/andhow/compile/CompileProblem.java
.../org/yarnandtail/andhow/internal/InternalUtil.java
...in/java/org/yarnandtail/andhow/util/AndHowLog.java	91.66% <0%> (+0.75%)	:arrow_up:

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[code4t2]

The maven-javadoc-plugin plugin declaration is duplicated, @rupeshA . I think @eeverman was referring to customizing the Javadocs using the doclet feature that the JDK provides

[eeverman]

I updated the description of #218

[rupeshA]

@eeverman , sounds cool indeed, will give thought to this.