Add known dwl tag status bar options to README.md

Merge pull request #251 from gwnichol/fixinstall

Fix make install while files are in use

Merge pull request #247 from Humm42/xkboptions

initialize xkb_rules.options to a null pointer

kill child process in cleanup()

Fix make install while files are in use

When the dwl executable is in use, cp fails without the -f flag.

POSIX defines this flag with:
> If a file descriptor for a destination file cannot be obtained,
> as described in step 3.a.ii., attempt to unlink the destination
> file and proceed.

add some blank lines

add click method configuration option

Add the libinput configuration option to choose between Software Button Areas and Clickfinger

add $(LIBS) to $(LDLIBS)

fix link failure with --as-needed

use LDFLAGS to build dwl target

do not generate *-protocol.{c,o}

according with
https://gitlab.freedesktop.org/wlroots/wlroots/-/commit/62fbf3f4ba1b2993e29dfb46f077e5806f7aac1c
they are unused and wlroots-based compositors don't need to do this

include xcb only when building with xwayland support

convert makefile to be more portable

improve client_from_wlr_surface()

fix compiler error with gcc complaining about parentheses

dwl.c: In function ‘unmaplayersurface’:
dwl.c:2253:9: error: suggest parentheses around assignment used as truth value [-Werror=parentheses]
 2253 |         layersurface->layer_surface->mapped = layersurface->mapped = 0;
      |         ^~~~~~~~~~~~
cc1: all warnings being treated as errors
make: *** [<builtin>: dwl.o] Error 1

clang not affected

disable scene node at unmaplayersurface()

initialize xkb_rules.options to a null pointer

Initializing it to an empty string had broken configuring xkbcommon
through the environment (XKB_DEFAULT_OPTIONS).

Fixes: ae313911153b ("initialize rules and xkb_rules")

call client_set-size() if client has a resize

check client_surface() returning NULL

now client_surface()->data is a pointer to the wlr_scene_tree of clients
which allows us to not call wlr_scene_node_lower_to_bottom() for every clients

correct libinput function name for drag_lock