Correct some settings mistake

Added losts of comments in AirTrafficControl and GroundControl
Created air traffic control spec
Add ground control spec
Correct a bug on the taxiway
When there is an error, the strip remains on the last knonw step
Add a plane that terminates after runway
Add level + CSS style of plane as pixel art
Adjust game settings for level 0,1,2
A plane that just lands waits before leaving the runway
Game generates only the number of planes to make the score good if no plane are lost during the game
Split level template to make specialized intro
Level 3: Add taxiway
Add level 4
Level 5

Add Actor per request pattern to ensure message delivery
Initialize remote app from infra/player
Separation between Client/Server/Messages

Add remote management of player
Multiple users is almost done

Missing: filtering events to see only events related to the current user
Add multiplayer feature

Need to avoir a user to register if the hostname is already registered
Add checks to prevent two users on the same hostname or the same mail
Add lister per player
 Correct some typo on specs
Change AckMaxTimeout and fix some typos