dispatchers: add documentation for fullscreenstate

[Buttars]

This is a WIP and needs feedback to clarify a few things. Specifically whether fullscreen is planned for deprecation and the functionality of state 3 "maximize and fullscreen."

[vaxerski]

then mark it as a wip

Specifically whether fullscreen is planned for deprecation

no

functionality of state 3 "maximize and fullscreen."

I actually dont know. @MightyPlaza maybe you know

[MightyPlaza]

functionality of state 3 "maximize and fullscreen."

I actually dont know. @MightyPlaza maybe you know

it's just maximized and fullscreen, but for most (if not all) purposes it will behave the same as fullscreen

for dwindle and master (and likely all other layouts) internally is the same as just fullscreen
when set in the client side it shouldn't make any difference either, but the wayland protocols don't seem to forbid setting both
maybe it makes a difference in some program