Move mouse to center of monitor if focused again

feat: access nth monitor

bump version to 0.7-rc1

prepare CHANGELOG.md for 0.7

changelog: add new 'unreleased' section

use the parent scene node to determine if move clients out of LyrFloat

[sevz: commit message is mine]

Reapply "place child clients above fullscreen clients"

This reverts commit 043ab3ac1335d7a1cd84fe0f9cea8056977211a4.

Merge branch 'wlroots-next'

bump to linux-dmabuf version 5

bump version to 0.6

prepare CHANGELOG.md for 0.6

Revert "place child clients above fullscreen clients"

This does not work as intended. Lets revert it temporarily and add it back
after the release.

This reverts commit 298949bbc4eae8cedb9cdd11cfc9ebd139ac5d5f.

Fix applybounds

Applybounds doesn't move client when it overlays
only with border with monitor to the right.

Apparently, c->geom.width already includes the border
as well.

feat: focus empty monitor when clicked

use round(3) and ceilf(3) from the math library

ΔSLOC: -1

set preferred scale after the first commit (XDGshell)

drop useless maplayersurfacenotify()

set O_NONBLOCK flag to stdout

add a note about having at least a dummy rule for `rules[]`

Closes: https://codeberg.org/dwl/dwl/issues/656

add bugref about why we call updatemons in outputmgrapplyortest