YWatchValueIndicator: prevent occlusion of value labels

[wirew0rm]

By default, if there are multiple YWatchValueIndicators close to each other, their label texts occlude each other. This PR implements an optional flag to move the value labels on a per axis basis.

Axis on the left shows the old and now default behaviour, the Axis on the right showcases the new feature:

[codecov]

Codecov Report

Merging #443 (634ed3d) into master (e684c8c) will increase coverage by 0.03%.
The diff coverage is 83.33%.

@@             Coverage Diff              @@
##             master     #443      +/-   ##
============================================
+ Coverage     53.22%   53.25%   +0.03%     
- Complexity     7344     7361      +17     
============================================
  Files           386      386              
  Lines         40646    40679      +33     
  Branches       6544     6553       +9     
============================================
+ Hits          21635    21665      +30     
- Misses        17461    17462       +1     
- Partials       1550     1552       +2     

Impacted Files	Coverage Δ
...ava/de/gsi/chart/plugins/YWatchValueIndicator.java	86.27% <83.33%> (-0.69%)	⬇️
...main/java/de/gsi/chart/ui/HiddenSidesPaneSkin.java	44.49% <0.00%> (-0.48%)	⬇️
...hart/plugins/measurements/DataSetMeasurements.java	75.60% <0.00%> (+0.17%)	⬆️
.../java/de/gsi/dataset/locks/DefaultDataSetLock.java	60.21% <0.00%> (+2.15%)	⬆️

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[RalphSteinhagen]

Very nice addition! 👍

@raven2cz this new feature might perhaps be also of interest for your use-case?