configure xwayland surfaces without monitors

For wine clients often configurex11() is called before mapnotify() and
therefore c->mon is NULL. configurex11 just returns early in that case,
letting these clients stay in the wrong size. For example only the top
left part of winecfg and wine uninstaller is drawn, or confirmation
dialogs like when closing wine notepad are too big. Fix this by
configuring their surfaces like before 88d386b.

implement the virtual pointer protocol

This is used by programs like warpd.

do not arrange monitor if it's disabled (wlroots!4520)

This causes us to send negative values to xdg-configures (e.g a bug in our end)

References: https://gitlab.freedesktop.org/wlroots/wlroots/-/merge_requests/4520
(cherry picked from commit 4043fc3093a73174cb63653ba9e742b4738f2ee5)

No need to call updatemons ourselves

The output manager in wlroots emits an output_layout.change event when
anything changes, so updatemons will be called anyway.

ΔSLOC: -1

drop unused variable

turn on -Wfloat-conversion

turn on -Wsign-compare

check if monitor is null before setting gamma

fixes segfault on monitor disconnect when using wlsunset

Destroy fullscreen node after moving clients off mon

fix posible NULL-dereference in wl_surface.commit handler

unset DISPLAY before setting up xwayland

only execute the first keybinding

more style fixes

missed from the previous iteration

create a wlr_keyboard_group for virtual keyboards

Fixes: https://codeberg.org/dwl/dwl/issues/554

fix typo

Fixes: 7afdc191fe4e9b3d16604b7f0c96f9741247e2d2
Thanks to: David Donahue <david.donahue2996@gmail.com>

tie xdg_toplevel_decorations to Client

a xdg_toplevel can only have one xdg_toplevel_decoration so there is no need to
have a new struct for decorations

Revert "nuke CSDs, hopefully for good!"

The compositor must respond to the client requesting a change to the decoration
mode, it does not matter if the compositor chooses a different mode.

This reverts commit 9071ce6c848ce214939fb84f85ae77de86de88d7.

Revert "remove typedef `Decoration`"

This reverts commit d1ff1e6f75d9c53c953957b5c0a64e0bcb40008b.

style fixes

use wlr_keyboard_group to manage all keyboards