It has been a while since the last optipng run (it was in 2015),
and many non-optimized PNG files have accumulated in the repository.
288 of 1666 files optimized, 258992 bytes reduced to 156258 bytes; -102734 bytes, -39.66%
To avoid unnecessarily increasing the size of Git repository for minor
size reductions, we skip images that weren't reduced by at least 15%.
* Flipped the arrow on the Update icon set to point downwards, since it's a download operation.
* Renamed existing small Update icon set Publish, and added downwards version to replace Update.
* Renamed all addon manager icons and their respective button definitions to be clearer.
* Moved unused small icon versions to their own subfolder.
* Added separate Publish inline button to image list. This is now used in all cases to publish,
regardless of whether the addon has been uploaded previously or not. Prior to this, the Install
button was used for non-published addons, and the Update one for published ones. This means the
* Refactor addon_list inline button setup to be clearer.
* Made inline Uninstall button display in all cases where an addon was installed, instead of just
INSTALLED and NSTALLED_UPGRADABLE. It will not display if a publishable addon has not been
published, however.
* Changed is_local check to match the ADDON_INSTALLED_LOCAL_ONLY. I figured this is a bit more
robust. TODO: do the same in the addon manager itself?
Art assets credit to @Lordbob
