Fixes#10059.
In 66df4e3e84,
`display: inline-flex` was added to `.pill-container` but
`flex-wrap: wrap` was missing which forced overflow pills to be on
one line and made the pill text overflow vertically. This was not
observed in composebox pills as `.pm_recipient .pill-container`
already had a `flex-wrap: wrap` rule which has been removed in this
commit to avoid duplication.
Adding the 20*20 image inside the pill caused a minor increase in
pill height. Making the image 19*19 causes some increase in the height
under different zoom conditions. I'm not sure about the reason behind
this, so this can be counted as a hack.
Allow passing image link in the item passed to appendValidatedData.
When passing image link via any of the append* functions, make sure
that create_item_from_text for that pill also adds the image link to
the item created.
This commit does not make any visual change to the current app.
Changes to user_pill.js are necessary to enable user avatars for
pills.
This commit transitions all styles in app.css in the Django pipeline
to being compiled by webpack in an app-styles bundle, and renames the
various files to now be processed as SCSS.
To implement this transition, we move the old CSS file refernces in
settings.py and replace them with a bundle declared in
`webpack.assets.json` and includedn in the index.html template
Tweaked by tabbott to keep the list of files in `app.css` in
`webpack.assets.json`, and to preserve the ordering from the old
`settings.py`.