don't double-add new monitor to mons

this was a copy/paste error

add cleanup listener for keyboards

add monitor destroy listener

reorder teardowns

fix more unfreed memory

output_layout_manager not auto-destroyed

xcursor_manager is not automatically destroyed

Merge pull request #16 from guidocella/killclient

Add killclient

Add killclient

let xdg be the plain "createnotify"

use x11 suffix for other function to match isx11, also shorter

xwayland is the exceptional case, let xdg be 0

condense appid/title logic

fix segfault on xwayland "appid"

xwayland: add server and basic window functionality (#10)

* xwayland: add server and basic window functionality

* xwayland: add server and basic window functionality

* xwayland: add server and basic window functionality

* xwayland: add server and basic window functionality

Add repeat delay and repeat rate to config.h (#13)

clear correct focus on keyboard leave

Don't pass NULL surfaces to wlr focus functions (#8)

Turns out that this will hit asserts that will abort dwl.

Handle missing XDG_RUNTIME_DIR explicitly

Also update the documentation to indicate that this is a Wayland thing
and not dwl-specific.

move perrors earlier

Should come right after the erroring call so nothing else has a chance
to overwrite errno

Add startup errors, mention XDG_RUNTIME_DIR in README

It was just exiting with code 1 for me. The problem turned out to be
that you *need* to set XDG_RUNTIME_DIR or it won't work (I think e.g.
systemd does that for you, but on Void it's not set by default), so
mention that in the README.