Release 0.9.13 "Saints" - Truth plot, colors, and bug fixes

This release focuses on graphics and a few user-reported bug fixes

New features

• bins computes frequency bins from statistics data
• Res sets the resolution when plotting
• HistogramPlot draws a histogram (frequency) plot from an array
• HSV generates a color pattern from hue, saturation and value
• Color generates a color pattern from an object, including names
• TruthPlot renders a truth value plot, with grayscale and color options
• Add a new XYPlots demo illustrating TruthPlot variants

Bug fixes

• Update the screen in Show when Pict is set
• Fix crash in Date+ when adding invalid dates
• Correctly update the UserModeMenu and annunciator when changing User mode
• The STO operation now works sensibly on flags
• Fixed a rare on-startup crash running tests in the debugger
• Invalidate the font cache when changing settings (notably FixedWidthDigits)
• Fix transient Input validation errors after text-editor errors
• Remove two extra parentheses in the documentation for settings

Improvements

• Transient Alpha now preserves existing Alpha / Lowercase mode
• Remove dependency on external crc32 utility, now use a local implementation
• Remove dependency on tac, replace it with tail -r
• Rendered graphics are now preserved in case of auto-power-off
• Avoid transient build errors on missing help directory
• Add documentation for ResetModes and usage example for Modes
• Negative dates now show as BC instead of with a minus sign