Minor changes to the travis file
Reuse TRAVIS_OS_NAME for ios, move the ios checks after all the others,
add a new line between sections, drop unneeded search path for osx.
07f3bf8d98a3
Hedgewars.png had a resolution more than twice as high as required; also fixed some (mostly obsolete) code that also contained a typo that would cause a warning/note in clang