View cone still not displayed...
Fix exceptions when sending `end` frame.
Merge branch 'client' into server

Conflicts:
	server/game_engine.py
Fix multiple sending of `end` frame.
This value has to be a float
Fix bug with `end` frame.
Merge branch 'client' into server
Merge branch 'server' of github.com:tdubourg/spylight into server
Minority change.
Minority fix.
Fix server shutdown process.
Minority change.
Fixed various problem with the turn and shoot events. The walk speed is now sent as a float instead of string. Added the step durations in game_constants. the server should use these ones instead of the ones from the cfg file
Merge branch 'client' of github.com:tdubourg/spylight into client
Merge branch 'server' into client
fixed another bug with the turn event, fixed the end game handling. It should not crash anymore
added the post game screen
added the post game screen
fixed the vision bug. Verified only with the spy
The walls and terminals are now rendered from the map's canvas instead of being added as widgets. Next step: using big walls instead of one for each tile. It should solve the performance problem