gnome-clocks waked patches: further fixes / upstreaming

Follow up to #962 (closed).

• initial: fork gnome-clocks to pmaports.git with waked + patch (!2342 (merged))
• fix snooze (!2375 (merged))
• fix timers (see below)
• further testing after everything is merged to pmaports for some time, to ensure it's stable
• gnome-clocks alarms are not registered with waked unless it's manually started after a reboot (#1189 (closed))
• try to upstream it as optional code path to gnome-clocks upstream, behind a build flag, disabled by default (make a new MR, that would replace the old one)
  • if upstream accepts it
    • wait until it lands in a new release
    • package the new release in alpine, together with waked
    • remove pmaports.git packages: gnome-clocks, waked
  • if upstream rejects it
    • get the patch together with waked into alpine's aports.git (I guess it would get accepted since this patch is required to work around a systemd api that we don't have)
    • remove it from pmaports