WebPlotDigitizer: Version 3.8 of WebPlotDigitizer

New Features:

• Added initial support for bar charts and histograms.
• Context sensitive algorithm options in the UI.
• Controls for measurement data made consistent with plot data.
• Added button to show extended crosshair next to image zoom options.
• Minor UI tweaks for better appearance across different platforms.
• Use alpha channel in zoom view for smoother appearance.

Bug Fixes and code clean-up:

• Code clean up based on JSHint suggestions.
• Fixed missing data point metadata in JSON files.
• Fix minor issues with graphics related to distance and angle measurements.
• Graphics related code clean-up.
• Fix minor issues related to blob detector algorithm.