Drops the in-tree icon theme parser and lookup logic in favor of
libsfdo-icon, which implements the icon theme spec.
Absolute icon paths are handled in swaybar itself with an access()
probe, since libsfdo intentionally doesn't deal with them. Pixmap
fallback still kicks in if load_image() fails on the absolute path.
KDE's IconThemePath is honored via sfdo_icon_theme_load_from() with
a per-SNI override theme that gets dropped when the property changes.
The min/max size cache per SNI is replaced by re-lookup when the
rendered size changes; libsfdo caches the parsed theme internally
and reads gtk's icon-theme.cache files, so this is cheap.
Theme switching at runtime is preserved via a new
tray_reload_icon_theme() called from parse_bar_config(). The old
code worked here implicitly because all themes were preloaded.
Closes: https://github.com/swaywm/sway/issues/8607
* The loop functions are now prefixed with `loop_`.
* It is now easy to add timers to the loop.
* Timers are implemented using pollfd and timerfd, rather than manually
checking them when any other event happens to arrive.
It's better to use DT_RPATH dynamic section of the elf binary to store
the paths of libraries to load instead of overwriting LD_LIBRARY_PATH
for the whole environment, causing surprises. This solution is much more
transparent and perfectly suitable for running contained installations
of wayland/wlroots/sway.
The code unsetting the LD_LIBRARY_PATH/LD_PRELOAD was also deleted as
it's a placebo security at best - we should trust the execution path
that leads us to running sway, and it's way too late to care about those
variables since we already started executing our compositor, thus we
would be compromised anyway.
This starts up the event loop and wayland display and shims out the
basic top level rendering concepts. Also includes some changes to
incorporate pango into the 1.x codebase properly.
