Provide global render functions fadeIn/fadeOut. Closes #154
Credits state. Closes #158
some warnings fix in WorldMapState
Merge pull request #166 from isage/fades

Provide global render functions fadeIn/fadeOut. Closes #154
Merge pull request #167 from isage/credits

Credits state. Closes #158
Merge pull request #168 from vvbalashoff/master

some warnings fix in WorldMapState