V2.0.0-beta build 11

• Increased timing between departures when airport is not congested
• Fix game server still running even when app is not in foreground on Android
• Fix datatag size for new aircraft spawning on Android not being bigger
• Update LAN, public multiplayer to use unique encryption keys
• Use host's datatag to determine the datatag position to be saved for aircraft under tower/ACC control

Full Changelog: v2.0.0-beta-b10...v2.0.0-beta-b11