Histogram Plots: Implement Show Plot Data

[magnesj]

Fixes #14360

"Show Plot Data" for histogram plots opened an empty text window, as RimHistogramPlot::asciiDataForPlotExport() was an unimplemented stub. In addition, the command was not available when right-clicking inside the plot widget.

Changes:

• Implement asciiDataForPlotExport() for histogram plots. For each visible curve, the export contains the curve name, a header row and one tab-separated row per bin (bin center and frequency). The values are computed from the curve's data source with the plot's current frequency type, so the exported numbers match what is plotted.
• Export one row per bin independent of graph type. Computing with the bar graph type would emit the step outline where every bin edge appears twice.
• Remove the unused asciiDataForHistogramPlotExport( DateTimePeriod, bool ) helper. The parameters were copied from the summary plot equivalent and have no meaning for histograms.
• Add a RiuContextMenuLauncher with RicShowPlotDataFeature to the histogram plot widget, following the same pattern as correlation, analysis and VFP plots.
• Format the table with RifCsvDataTableFormatter using tab as field separator, so the text can be pasted into Excel with bin centers and frequencies in separate columns.

Example output:

Histogram Plot

SOIL, NORNE_ATW2013_RFTPLT_V2, All Time Steps
Bin Center	Relative Frequency [%]
0.02797	55.97580
0.08950	0.23812
...

[Copilot]

Pull request overview

This PR completes the “Show Plot Data” functionality for histogram plots by implementing RimHistogramPlot::asciiDataForPlotExport() (previously a stub) and making the command available from the histogram plot widget’s context menu.

Changes:

• Implemented histogram ASCII export by recomputing each visible curve with the current frequency type and emitting one tab-separated row per bin (bin center + frequency).
• Ensured export output is independent of render graph type by computing with LINE_GRAPH to avoid duplicated edge values from bar/step outlines.
• Added RiuContextMenuLauncher to the histogram plot widget and removed the unused histogram-export helper declaration.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
ApplicationLibCode/ProjectDataModel/Histogram/RimHistogramPlot.h	Removes unused histogram-export helper declaration and an unused include.
ApplicationLibCode/ProjectDataModel/Histogram/RimHistogramPlot.cpp	Implements histogram plot ASCII export and adds “Show Plot Data” to the plot widget context menu.

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