-s: close unused fds

dup2 doesn’t close fds, it only duplicates them.  The old ones weren’t
closed, causing problems (like dwl blocking due to the child process
never reading from the reading end, even if stdin has been closed).

document status information and <&- in README

As mentioned in #158.

Merge pull request #152 from ARDiDo/no_redundant_xcursor

remove redundancies in xcursors

Remove redundant xcursor manager

update deprecated xkb function name

Merge pull request #136 from guidocella/presentation-time

implement the presentation time protocol

Merge pull request #130 from drdonahue/printstatus-fix

Fix excessive printstatus() calls when dmenu is up

implement the presentation time protocol

This lets applications, such as mpv with --video-sync=display-resample,
know accurately when frames are displayed and ensure smooth video
playback.

Moved printstatus() call in focusclient() to prevent printstatus being called on every frame when things like dmenu are up

update notes about starting dwl

Includes mention of video/input groups

Merge branch 'xdg-activation' into wlroots-next

Merge branch 'main' into wlroots-next

mention `-devel` packages

It seems like there are people trying dwl who aren't as familiar with
how their distros do development, so let's give them a pointer in the
right direction.

exit cleanly on INT/TERM

handle ephemeral pageflip failures

If a transient failure occurs in wlr_output_commit, re-render until it
doesn't happen.  This could possibly be removed if we decide to
implement damage tracking in the future.

print status on output create

Along with starting the -s command earlier, this will allow the initial
monitor setup to generate printstatus info.

Merge branch 'main' into wlroots-next

factor xwayland hackiness out into client.h

Merge pull request #122 from Sevz17/set-tiled-on-map

before set tiled verify if client is xdg-shell, then set tile

before set tiled verify if client is xdg-shell, then set tile