Add Promotion Avg & Total To Summary

[amcrn]

Adds avgPromotion and promotionTotal to the Summary output.

Example:

avgPromotion; 2,925; K
promotionTotal; 3,820; M

[codecov-io]

Codecov Report

Merging #203 into develop will increase coverage by 0.37%.
The diff coverage is 100%.

@@              Coverage Diff              @@
##             develop     #203      +/-   ##
=============================================
+ Coverage      69.39%   69.77%   +0.37%     
- Complexity      1467     1475       +8     
=============================================
  Files            145      145              
  Lines           8366     8374       +8     
  Branches        1368     1370       +2     
=============================================
+ Hits            5806     5843      +37     
+ Misses          1981     1955      -26     
+ Partials         579      576       -3

Impacted Files	Coverage Δ	Complexity Δ
...raum/perf/gcviewer/exp/impl/SummaryDataWriter.java	87.68% <100%> (+9.73%)	31 <0> (+5)	⬆️
.../com/tagtraum/perf/gcviewer/util/MemoryFormat.java	88.88% <0%> (+4.76%)	12% <0%> (+1%)	⬆️
...va/com/tagtraum/perf/gcviewer/util/TimeFormat.java	65.62% <0%> (+12.5%)	6% <0%> (+1%)	⬆️
...om/tagtraum/perf/gcviewer/util/FormattedValue.java	90.9% <0%> (+36.36%)	4% <0%> (+1%)	⬆️

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[chewiebug]

Thank for the second contribution (I have also merged it).