Updates logic submodule. Refs #29.
Uses n_global.nim from logic submodule. Refs #29.
Updates build script clean targets' paths. Refs #29.
Moves more objc to logic submodule. Refs #29.
Uses new NSStringFromClass wrapper. Refs #29.
Casts unsigned to signed to avoid warning. Refs #29.
Documents task in changes log. Refs #29.
Merge branch 'feature/t29_refactor_common_code'