Merge branch 'patch/focusnthclient' into v0.6-a/patched-base

Focus nth client

Merge branch 'patch/foreign-toplevel-management' into v0.6-a/patched-base

Fix sticky

Merge branch 'patches/bottomstack' into v0.6-a/patched-base

Merge branch 'patch/namedscratchpads' into v0.6-a/patched-base

Merge branch 'patch/ipc' into v0.6-a/patched-base

Merge branch 'patch/singletagset' into v0.6-a/patched-base

Merge branch 'patch/sticky' into v0.6-a/patched-base

Merge branch 'patch/swallow' into v0.6-a/patched-base

Merge branch 'patch/naturalscrolltrackpad' into v0.6-a/patched-base

Merge branch 'patch/movestack' into v0.6-a/patched-base

Merge branch 'patch/centeredmaster' into v0.6-a/patched-base

feat: access nth monitor

Fix getunusedtag, attachclients

If client is on multiple monitors, it should
be hidden, as the client is visible just on one of
the monitors, and on the other there is empty space instead

Unused tags are only the tags that are not on any
of the monitors.

implement foreign toplevel management

feat: add sticky windows

feat: natural scrolling only for trackpad

add bstack and bstackhoriz layouts

implement centeredmaster layout

inspiration: https://github.com/djpohly/dwl/wiki/centeredmaster