HistogramRenderer for non-equidistant and/or vertical histograms

[RalphSteinhagen]

• added HistogramRenderer with support for non-equidistant binning and/or vertical Histograms or DataSets
• added missing set(DataSet) functionality and optional x/y sorting to LimitedIndexedTreeDataSet implementation
• upgraded DataSetMath: support math-operation on DataSets with different x-axis sampling
  N.B. extra code-clean up replaced Math with MathBase were applicable
• added HistogramRenderer, new HistogramRendererBarSample and unit-tests
  addresses some of the collateral issues posted in The first and last bins of histograms are not drawn - FIXED #80 Histogram bin width does not match actual bin range #246 BarChart: non equidistand data and last data point not drawn #265

Initial histogram concept/inspiration (courtesy Sitara S.):

example outputs:

[wirew0rm]

Looks Great!

[codecov]

Codecov Report

Merging #292 into master will increase coverage by 0.54%.
The diff coverage is 67.43%.

@@             Coverage Diff              @@
##             master     #292      +/-   ##
============================================
+ Coverage     49.78%   50.33%   +0.54%     
- Complexity     6861     7031     +170     
============================================
  Files           380      382       +2     
  Lines         40065    40508     +443     
  Branches       6420     6523     +103     
============================================
+ Hits          19947    20388     +441     
+ Misses        18709    18679      -30     
- Partials       1409     1441      +32     

Impacted Files	Coverage Δ	Complexity Δ
.../de/gsi/dataset/spi/LimitedIndexedTreeDataSet.java	6.69% <3.22%> (-0.92%)	3.00 <0.00> (ø)
...ain/java/de/gsi/dataset/spi/AbstractHistogram.java	58.26% <66.66%> (+40.43%)	26.00 <12.00> (+20.00)
...a/de/gsi/chart/renderer/spi/HistogramRenderer.java	67.41% <67.41%> (ø)	84.00 <84.00> (?)
...et/src/main/java/de/gsi/dataset/spi/Histogram.java	83.82% <76.92%> (+71.47%)	31.00 <17.00> (+24.00)
...fx-math/src/main/java/de/gsi/math/DataSetMath.java	62.22% <78.15%> (+3.81%)	120.00 <35.00> (+26.00)
...hart/plugins/measurements/DataSetMeasurements.java	75.77% <100.00%> (ø)	153.00 <0.00> (ø)
...ataset/src/main/java/de/gsi/dataset/Histogram.java	100.00% <100.00%> (ø)	0.00 <0.00> (?)
...gsi/dataset/testdata/spi/AbstractTestFunction.java	68.18% <100.00%> (ø)	10.00 <2.00> (ø)
...ava/de/gsi/dataset/testdata/spi/GaussFunction.java	100.00% <100.00%> (ø)	6.00 <1.00> (+1.00)
... and 13 more

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[wirew0rm]

lgtm