Merge version 3.3.2 from upstream into android

Merge version 3.3.1 from upstream into android

Merge version 3.3.0 from upstream into android

• Merge version 3.2.0 from upstream into android
• Install game data from .zip archive

• Merge version 3.1.2 from upstream into android
• fix text input on devices with on-screen keyboard

• Update sdl to v2.0.18, fixes fog of war rendering
• Use real display size without navbar
• Reenable mouse in menu, fixes #4
• Controls description, fixes #3

Use https://github.com/drodin/wargus/releases/tag/v3.0.0-dev1 to generate 'game data files'
Copy %APPDATA%\Stratagus\data.Wargus folder to SD card and select it in the start dialog

old release 0.9-beta
first google play version 0.8.5-beta
Data generation scripts for Windows *.exe