Hedgewars: Move platform code in its own folder
completed by: Drew Gottlieb
mentors: koda, Andrey Korotaev, Xeli, Sheepy
Our frontend contains some source files written in Objc++ for some OS X functionality. Your task is to move every *.mm file in QTfrontend/platform, update the build system (.pro and CMakeLists.txt) and fix the deprecation warning.
A working patch, that applies cleanly to our source tree. This patch should be in the form of a pull from clone,
hg export or unified diff format (in order of preference) implementing the functionality required.