add background images for new types

[robx]

pzprjs traditionally has a dedicated background tile for each puzzle type. For some types these are missing, particularly all recently added types.

The current list of backgrounds is here: https://github.com/robx/pzprjs/blob/master/src-ui/js/ui/Misc.js#L81

The list of valid pids is here: https://github.com/robx/pzprjs/blob/master/src/pzpr/variety.js#L68

Current list of missing background images, via

(sed -ne '/toBGimage/,$p' < src-ui/js/ui/Misc.js | grep ': \[' | awk -F ':' '{print $1}' | tr -d '       '; ls src-ui/img | sed -e 's/.png$//') | sort > imgs
sed -ne '/Genre/,$p' < src/pzpr/variety.js | grep ': \[' | awk -F ':' '{print $1}' | tr -d '     ' | sort > pids
diff -u pids imgs

• [ ] yajilin-regions
• [ ] armyants
• [ ] arukone
• [ ] meander
• [ ] onsen
• [ ] simpleloop
• [ ] stostone
• [ ] usoone

It might be possible to port the background images for some of these from upstream pzpr.

[boboquack]

Curve Data png (16x12 tile) [hopefully doesn't have artefacts this time]

[boboquack]

Kropki png (16x16 tile) or a lighter version or a darker version

[boboquack]

Hetermonino png (45x45 tile)

Also the Kropki one was the wrong size here is an actual 16x16 one (the other was 17x16 so some of the 'squares' were rectangles)

[x-sheep]

Nondango (21x21)

[robx]

applied, thanks!

[boboquack]

(we've had a few new puzzle types in the past few weeks: off the top of my head, tents, detour, snake and symmetry area might want to be added to the list)