added ccache option for makefile, supports g++ and clang
fix for mainline builder
Prevent memory leak by automatically deleting the item info when the scope is left
Merge branch 'makefile_ccache' of https://github.com/DavidKeaton/Cataclysm-DDA into ccache
Merge branch 'another-memory-leak-this-time-with-windows' of https://github.com/BevapDin/Cataclysm-DDA into windel