- Add missing doc/webp_figures.gnu fronm upstream git repo

- Update to gnuplot 6.0.0
  * Japanese documentation updated
    (missing file title-ja.tex, build dependencies for mingw)
  * Support building against Qt6
    (./configure falls back to Qt5 if the Qt6 libraries are not found)
  * New configure option --enable-stable-sort
    1) Use mergesort rather than qsort if the system provides it.
    2) If neither mergesort nor glibc stable qsort is available,
       modify internal gnuplot structures to contain a secondary sort key
  * Render color gradient in colorbox as a pixel array (cairo, qt terminals)
  * "reset session" restores initial state of all linetype properties
  * postscript terminal now handles pixmaps (Bug #2644)
  * New plot style "with contourfill" handles 2D and 3D contour plots with
    discrete z-ranges indicated by solid fill colors.
  * FIX do not clobber a datablock if its name is encountered unexpectedly
  * FIX cairo terminals:  ignore zero-size polygons
  * FIX svg terminal now correctly tracks pattern-fill color
  * FIX integer overflow/wraparound when polygon is clipped to plot border
  * FIX do not mangle variable point properties in polar mode Bug #2650
  * partial support for replotting and mousing multiplots (finally!)
  * fixes build error for postscript terminal when libgd and cairo are not present
  * strip trailing CR from function blocks read from a dos file   Bug #2653
  * use 64-bit integers for iteration
  * "unset pointintervalbox" disables the box rather than setting it to default size
  * keyentry '...' can be used to place a secondary title in the key
  * fix use of stacked histograms with variable number of data columns
  - Replotting and mousing multiplots
    o now working much more comprehensively

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