Updated FindCorrade.cmake from Corrade repository.
Expose MAGNUM_BUILD_STATIC in magnumConfigure.h.
FindMagnum.cmake: append MAGNUM_LIBRARIES also for static build.
FindMagnum.cmake: NaCl application has also dependencies.

Although these are needed only with static build.
Added files for automatic resource importing from static libraries.

Not documented yet, because I am ashamed of this way of doing things.
With shared libraries the resources are imported automatically, with
static ones the user must explicitly include these files in some
non-static library or executable to have them imported.
Updated toolchains submodule.