Feature for issue #99 make poll interval (HTTP HEAD) customizable

[aolle]

Added new preferences menu, now we can modify/configure the amount of time used by the WatchDog thread timer task.

[codecov-io]

Codecov Report

Merging #178 into develop will decrease coverage by 0.04%.
The diff coverage is 74.41%.

@@             Coverage Diff             @@
##           develop     #178      +/-   ##
===========================================
- Coverage    62.62%   62.58%   -0.05%     
===========================================
  Files          140      142       +2     
  Lines         8057     8109      +52     
  Branches      1454     1458       +4     
===========================================
+ Hits          5046     5075      +29     
- Misses        2532     2555      +23     
  Partials       479      479

Impacted Files	Coverage Δ
...om/tagtraum/perf/gcviewer/view/ActionCommands.java	100% <100%> (ø)	⬆️
.../com/tagtraum/perf/gcviewer/ctrl/action/Watch.java	32.72% <32.72%> (-2.57%)	⬇️
...perf/gcviewer/ctrl/action/WatchDogReloadDelay.java	57.89% <57.89%> (ø)
...aum/perf/gcviewer/ctrl/action/RefreshWatchDog.java	7.14% <7.14%> (+7.14%)	⬆️
...agtraum/perf/gcviewer/view/GCViewerGuiMenuBar.java	74.19% <75.4%> (+2.26%)	⬆️
...um/perf/gcviewer/view/WatchDogReloadDelayView.java	82.35% <82.35%> (ø)
...um/perf/gcviewer/ctrl/impl/GCViewerGuiBuilder.java	94.81% <94.79%> (+0.05%)	⬆️
...va/com/tagtraum/perf/gcviewer/view/GCDocument.java	33.97% <0%> (-1.93%)	⬇️

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