some reverse-proxies expect plaintext replies, and
we don't have a brotli decompressor to satisfy this
additionally, because brotli is https-gated (thx google),
it was already an impractical mess anyways
the sfx is now 7 KiB larger
primarily to support uploading from Igloo IRC but also generally useful
(not actually tested with Igloo IRC yet because it's a paid feature
so just gonna wait for spiky to wake up and tell me it didn't work)
* error-message which explains how to run on py2 / older py3
when trying to run from source
* check compatibility between jinja2 and cpython on startup
* verify that webdeps are present on startup
* verify that webdeps are present when building sfx
* make-sfx.sh grabs the strip-hints dependency
mainly motivated by u2cli's folder syncing in turbo mode
which would un-turbo on most dupes due to wrong lastmod
disabled by default for regular http listings
(to avoid confusion in most regular usecases),
enable per-request with urlparam lt
enabled by default for single-level webdav listings
(because rclone hits the same issue as u2cli),
can be disabled with arg --dav-rt or volflag davrt
impossible to enable for recursive webdav listings