Restyle add visibility state and toggling of datasets

[restyled-io]

A duplicate of #481 with additional commits that automatically address
incorrect style, created by Restyled.

⚠️ Even though this PR is not a Fork, it contains outside contributions.
Please review accordingly.

Since the original Pull Request was opened as a fork in a contributor's
repository, we are unable to create a Pull Request branching from it with only
the style fixes.

The following Restylers made fixes:

• clang-format

To incorporate these changes, you can either:

1. Merge this Pull Request instead of the original, or

2. Ask your contributor to locally incorporate these commits and push them to
   the original Pull Request

   Expand for example instructions

   ```console
   git remote add upstream https://github.com/GSI-CS-CO/chart-fx.git
   git fetch upstream pull/<this PR number>/head
   git merge --ff-only FETCH_HEAD
   git push
   ```
   

NOTE: As work continues on the original Pull Request, this process will
re-run and update (force-push) this Pull Request with updated style fixes as
necessary. If the style is fixed manually at any point (i.e. this process finds
no fixes to make), this Pull Request will be closed automatically.

Sorry if this was unexpected. To disable it, see our documentation.

[codecov]

Codecov Report

Merging #482 (9254bfd) into master (89a5ad3) will decrease coverage by 0.19%.
The diff coverage is 30.90%.

@@             Coverage Diff              @@
##             master     #482      +/-   ##
============================================
- Coverage     53.63%   53.43%   -0.20%     
+ Complexity     7477     7473       -4     
============================================
  Files           389      389              
  Lines         40952    40989      +37     
  Branches       6604     6615      +11     
============================================
- Hits          21963    21903      -60     
- Misses        17404    17501      +97     
  Partials       1585     1585              

Impacted Files	Coverage Δ
...rc/main/java/de/gsi/chart/plugins/EditDataSet.java	23.21% <0.00%> (-0.19%)	⬇️
...gsi/chart/renderer/spi/ContourDataSetRenderer.java	76.04% <0.00%> (ø)
...gsi/chart/renderer/spi/LabelledMarkerRenderer.java	83.87% <0.00%> (-1.10%)	⬇️
.../gsi/chart/renderer/spi/MountainRangeRenderer.java	0.00% <0.00%> (ø)
...e/gsi/chart/renderer/spi/ReducingLineRenderer.java	0.00% <0.00%> (ø)
...rt/renderer/spi/financial/CandleStickRenderer.java	88.60% <0.00%> (-0.64%)	⬇️
.../chart/renderer/spi/financial/HighLowRenderer.java	85.33% <0.00%> (-0.67%)	⬇️
...-dataset/src/main/java/de/gsi/dataset/DataSet.java	100.00% <ø> (ø)
...ain/java/de/gsi/dataset/spi/TransposedDataSet.java	84.42% <0.00%> (-1.41%)	⬇️
.../de/gsi/dataset/testdata/spi/ErrorTestDataSet.java	74.69% <0.00%> (-1.85%)	⬇️
... and 10 more

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