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

request description before logs

turn on -Wfloat-conversion

turn on -Wsign-compare

acknowledgements refactoring

clarify the code will be kept as small as possible

check if monitor is null before setting gamma

fixes segfault on monitor disconnect when using wlsunset

drop SLOC limit

prefer functionality over philosophy

add acknowledgment to djpohly

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