FighterWing 2 Spitfire

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+++++++++++ FW2SPIT 2018 06 25 (v. 1.4) ++++++++++
- Additional changes on ad handling. Now the scene is not rendered
while ad is about to appear.
- Removed a surprising ad while waiting for the de-briefing.
- Added a new could/weather controller (based on FW1). Now every scene
has a new cloud coverage.