1. src/CMakeLists.txt to build cookie independently of any other Mir code
2. include/cookie/mir_toolkit/cookie.h to compile standalone and add to mir_toolkit docs
3. include/cookie/mir/cookie_factory.h include include/cookie/mir_toolkit/cookie.h first (to ensure it compiles standalone) and move doc comment to correct type.
Pushed trivial fixes:
1. src/CMakeLists.txt to build cookie independently of any other Mir code cookie/ mir_toolkit/ cookie. h to compile standalone and add to mir_toolkit docs cookie/ mir/cookie_ factory. h include include/ cookie/ mir_toolkit/ cookie. h first (to ensure it compiles standalone) and move doc comment to correct type.
2. include/
3. include/