gulp: extend environment for tweego, but not replace it

See merge request pregmodfan/fc-pregmod!9094

stop "restore fertility" from showing on pregnant slaves

See merge request pregmodfan/fc-pregmod!9093

gulpfile: do not run tweego three times in a row

See merge request pregmodfan/fc-pregmod!9092

Gulp runs shell pipe for each source file, which are now 3. Redefine the
tweego task as a simple shell command to run tweego only once.

saAgent fixes

See merge request pregmodfan/fc-pregmod!9091

Webgl load fix

See merge request pregmodfan/fc-pregmod!9090

Webgl updates

See merge request !9048

Add minifier binaries and use in bash compile script

See merge request pregmodfan/fc-pregmod!9089

Improve vector art pruning

See merge request pregmodfan/fc-pregmod!9087

Add asset links for not included art options

See merge request !9084

clean up reTasteTest.js

See merge request pregmodfan/fc-pregmod!9088

Prune attributes with bad namespace from vector art files during compile, rather than during startup.
Regenerate all the vector art without the bad attributes.
Delete a few art files that can't be regenerated and aren't referenced in code.
Hand-edit a handful of files that can't be regenerated but ARE referenced in code.

Resync FCHost with Chromium 89 and target VS2019 instead of VS2015

See merge request !9086

Resync build scripts with Chromium 89 and target VS2019 instead of VS2015 so we can use C++17 std::filesystem.

Taste test js

See merge request !9063

remove unnecessary braces from changelog.

See merge request !9083

They existed for links, but we don't use that. Our regex doesn't care either way.

RESS.tw tweaks

See merge request !9082