Revert "only call wlr_seat_keyboard_notify_enter() if a keyboard is found"

This reverts commit 8e03bce6217117f0687cd727ae2c47bdd3c0fe5a.
fixes #270

only call wlr_seat_keyboard_notify_enter() if a keyboard is found

check pointer focus in arrange()

arrange client's monitor if size has change since last commit

resize now takes `struct wlr_box` as parameter

check current and pending geometry to set c->resize to zero

Fixes #260

Checks for overflows for client max width and height

respect size hints

inline unmaplayersurface() into unmaplayersurfacenotify()

unmap signal is guaranted to be emitted before destroy signal
so is useless checking if it is mapped at destroy

avoid layer surface popups appearing below x{dg,wayland} clients

unconstrain layer shell popups from monitor size

unconstrain other popups from monitor usable area

use LayerSurface.mon when possible

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()