primitives: don't rotate when no mouse button is pressed.
Adapted to Magnum changes.
Adapted to Magnum changes.

Hah. It reeks like code copy, I should make a function for that already.
Adapted to Magnum changes.

Framebuffer example was leaking the image.
viewer: set normal matrix consistently.

It still crashes, need to solve precision problems.
Adapted to Magnum changes, fixed example documentation.
Updated Find*.cmake modules from Corrade and Magnum repositories.
There will be no unit tests in examples.

Why, actually? Example showing TestSuite framework usage is already in
Corrade.
Ability to selectively build examples with additional dependencies.
Updated toolchains submodule.
Merge branch 'master' into ports

Conflicts:
	src/CMakeLists.txt
	src/primitives/PrimitivesExample.cpp