* Make ghost roles collapsible
* Save `BodyVisible` state of each `Collapsible` box
* Make ghost role collapsible only when group has more than 1 role
* Make it a little prettier
* Make only ghost role buttons collapsible
* Apply requested changes
* Typo
* Small cleanup
* Store in list, instead of iterating
* Make unique ids more unique
* Move it out of the cycle
* Make _collapsibleBoxes into dictionary and use key instead of Collapsible boxes names
Added TODO. So after the problem will be fixed in `GhostRolesEui`, it should be mirrored and fixed here too.
* Put TODO in GhostRolesEui. I guess Issue must be made for this
* Use HashSet instead of Dictionary as suggested. Invert the HashSet, so being present means it uncollapsed
I decided to invert HashSet to _uncollapsedStates, because players surely will have more collapsed buttons than opened, so we optimise memory usage a little bit.
* Remove extra space from ghost roles window
* Add buttons stretching. Size 3:1
(cherry picked from commit cc3a19c212e96eda25236060c7809a66a69d7bdd)
