change project to use clang modules (closes #251)
change project to use clang modules (closes #251)

puremourning/littlego,herzbube/littlego,puremourning/littlego,herzbube/littlego,herzbube/littlego,herzbube/littlego,herzbube/littlego,puremourning/littlego,puremourning/littlego