New icons for expanding and collapsing groups will be introduced
by next commit, so rename the current one to right.svg - it also
better matches the current filename layout, since we have up.svg,
down.svg, and left.svg.
The current icon style is somewhat all over the place, with some
icons having thin lines, some others having thicker lines; some
filling the pixel grid in center, others in edges; some trying to
reduce subpixel positioning, some completely unaware of it.
Rework these icons to have a consistent style, with elongated
lines, rounded strokes, and proper center alignment.
The "no_sources.svg" asset is not covered by this work because this
empty state will be worked on in a separate commit.
Further changes will adjust specific UI elements to better match
the icon style.
These icons are derived from the GNOME icon library. I've changed
the fill colour to #fefefe for Dark theme icons, and #000000 for
embedded icons. If further icons are needed, they can be found at
https://teams.pages.gitlab.gnome.org/Design/icon-development-kit-www/
This changes all of the icons from png to svg. With svgs, scaling is
unlimited. With the svgs, the issue of the @ symbols with the Windows
updater is no longer an issue.
I changed the colors of the icons to a light gray (#d2d2d2), in the
dark themes, because I thought they looked better with this color.
The mute, unmute, plus, minus, up, down and expand icons are from the
Feather Icons set. https://feathericons.com/
The visibility icon is from the Octicons set. https://octicons.github.com/
The locked and unlocked icons are from the Open Iconic set.
https://github.com/iconic/open-iconic
