make XWayland clients inherit tags and monitors

Revert 3213088 because the linked bug can no longer be reproduced with
wlroots 0.17, and update client_get_parent() so it doesn't segfault with
XWayland surfaces. This also allows reusing the p variable in the next
commit.

remove useless wlr_scene_node_reparent() calls

These don't do anything because wlr_scene_node_reparent() is immediately
called again by setfloating() through setmon(). They are also a source
of confusion because if you change the wlr_scene_node_reparent() call in
applyrules() it takes a while to understand why it doesn't work.

Revert "No need to call updatemons ourselves"

Fixes: https://codeberg.org/dwl/dwl/issues/577

This reverts commit 26d7c9689f6e7eb699f2a63c2093c2a27e411ea3.

Correct specifier-data_type mismatches

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