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

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

Focus nth client

Merge branch 'v0.6-a/keycodes-modes' into v0.6-a/patched-keycodes

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/swallow' 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 modes code to support keycodes patch

Merge remote-tracking branch 'modes/v0.5/modes' into v0.6-a/keycodes-modes

add bstack and bstackhoriz layouts

implement centeredmaster layout

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

use keycodes instead of keysyms

inspiration: https://codeberg.org/dwl/dwl-patches/wiki/keycodes

implement dwl-ipc-unstable-v2
https://codeberg.org/dwl/dwl-patches/wiki/ipc

Fix rule examples; minimize newbie surprises

Make example rules be actual EXAMPLES.
Now newcomers should not have to ask, "When I start firefox, nothing
happens. What is going on?"

Also clarified a minor typo and a consistency in spacing.

add examples

implement modes

like sway/river modes