This reverts loader indicator from the new fontawesome
`icon-button-loading` to previous SVG one, this change is only reflected
to those loaders which use `loader.handlebars` template for
loading indication(because there are some indicators like "Save changes"
in org settings which don't use loader.handlebars).
This main problem with this indicator is that it is bit
inconsistent with other places where we use `loader.handlebars` like
loading Zulip icon which appears while fetching old messages.
This commit changes the way the save and discard buttons on the
organization profile, settings and permissions tabs look and fades
them out after a delay. It also cleans up the code a bit in the
settings_org.js file. It introduces changes to the css in
settings.css as well as the template for save-discard buttons.
It also fixes a bug on the user settings whereby if an option
that requires reload is clicked before clicking an option that does
not require reload, the reload message is erased. This could create
an issue where the user is not aware that a reload is required.
The loader is also changed to using fa-icon as loading spinner on
user settings and the colors are tweaked a little bit.