Allow clicking on the worker/fighter button once than once per turn
fixes #311
When a player is rejected from the lobby (not assigned in a seat), game should start normally for the other players.
fixes #315
Merge pull request #316 from hwoarangmy/development

When a player is rejected from the lobby, game should start normally for the seated players + allow clicking fighter button more than once per turn
Merge pull request #317 from Bertram25/development

CMake linux option not to grab keyboard + Added support to build a crypt
Added possibility to setup alliances in the lobby
fixes #310

The available team ids that a seat can use are defined in the level file
Note that the order matters as the first one in the list will be selected by default.
With this logic, some seats can be sealed while others can be setup in the same level.
Examples to test are used in multiplayer small test map FFA and skirmish 2v2 small test map.
Workers with claimrate = 0 should not try to claim. Same for digging.
fixes #308
Changed the KnightCoffin material to use the same texture as the Knight statue.

Since they were using the same bits anyway.
I didn't used the model given by Danimal, since it was the same model in an older format.
Fixed adding Crypts in the Editor.

Fixes #320
Merge pull request #321 from Bertram25/boulder

Some quick-fixes
Merge pull request #319 from hwoarangmy/development

Added possibility to setup alliances in the lobby + workers with claimrate = 0 do not claim anymore