Support pointer constraints and relative pointer protocols

Fixes: https://codeberg.org/dwl/dwl/issues/489
FIxes: https://codeberg.org/dwl/dwl/issues/317

turn on -Wfloat-conversion

turn on -Wsign-compare

include CHANGELOG.md in the tarball

Fixes: 24576f1fdf56bc8879203bb2d7e7cd116d4bba42

Merge branch 'wlroots-next'

enable debug symbols by default

they does not affect performance and the size's increase is negligible

Merge remote-tracking branch 'upstream/main' into wlroots-next

include dwl.desktop in the tarbal

Merge remote-tracking branch 'upstream/main' into wlroots-next

allow specify DATADIR (to install desktop file)

Add desktop entry file

add support for cursor-shape-v1

References: https://gitlab.freedesktop.org/wlroots/wlroots/-/merge_requests/4106

Merge remote-tracking branch 'upstream/main' into wlroots-next

convert some warnings to errors

Merge remote-tracking branch 'djpohly/main' into wlroots-next

rework Makefile

- allow user to use a different pkg-config binary
- restore almost all (and add other ones) warning flags (-Werror is not set)
- $(XWAYLAND) is added to our CPPFLAGS
- remove useless comments
- don't generate idle-protocol.h (not used)

define _POSIX_C_SOURCE through CPPFLAGS

like dwm

Merge remote-tracking branch 'djpohly/main' into wlroots-next

fix dist target

include DWLCFLAGS into linking step