runtime(i3config/swayconfig): update syntax scripts

modifications with the goals of:
- simplifying structure by using group `cluster`s
- improving visual highlighting responsiveness by using `nextgroup`
- improving recursive wm-msg command highlighting
- separating command variants meant for runtime and for config only

closes: #14544

Signed-off-by: Josef Litoš <[email protected]>
Signed-off-by: Christian Brabandt <[email protected]>

Author: litoj