Fix board settings save with empty custom css

See merge request fatchan/jschan!243

`empty_string && something` is empty string, which fails the `=== false` check
in checkSchema.

even though the image is a blob, when we set the src={blob}, it doesnt load immediately
thus, the offsetWidth is 0 and when expanding, the filename width is wrong (only on the first time expanding, since subsequent times, the blob has "loaded" already and now has an offsetWidth -- it is almost instant).
this adds and onload to wait for the image to "load", and thus has the correct width even on the first time when expanding

v0.3.2

See merge request fatchan/jschan!239

0.3.1 webring patches

See merge request fatchan/jschan!238

set a (still generous) 20s timeout instead of whatever insane node-fetch default is, seems like 60s or 120s
small bugfix to visit counts

and actually use the promises array

when webring not enabled, remove unnecessary call to Boards.webringSites() since the only site name will be the local meta.siteName

make webring blacklists apply to endpoints after fetching too, to handle duplicate domains (mirrors, onion, etc)

v0.3.0

Closes #420

See merge request fatchan/jschan!237

reverse changelog so most recent is at the top
update package.json and package-lock.json
change irc channel

adjust ban duration edit  minimum, so dates (or invalid input) returned as 0 are not allowed
change error message for ban_duration

fix bottom reply when thread reaches reply limit

See merge request fatchan/jschan!236

make it a global setting, add to the settings modal, make it export/import properly, etc
bugfix includeChildren for settings diff, because some gulp tasks were not being run when needed

npm audit