unconstrain layer shell popups

also unconstrain popups from monitor's usable area

don't set `c->isfullscreen` to zero

calloc initializes all fields to zero

move ugglyness to client.h

remove unneeded check in focusclient()

kill child process in cleanup()

add click method configuration option

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

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()

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

destroy layersurface's scene node in destroylayersurfacenotify()

add a new function to get a client from a wlr_surface

Add configuration options for touchpads

implement urgency hints for xwayland clients

fix segfault when dragging chromium tabs

Run focusclient when switching to monocle layout

remove trailing whitespaces

add `-v` flag to the manpage

Thanks @Humm42

add flag to print version and exit