Interconnect: include full information in both StateMachine signals.
Interconnect: update docs.
Interconect: added StateMachine::stepped() signal.

This thing is now officially the craziest implementation I have ever
created. Muhehehehahahoho.
Fix: inexistent -> nonexistent.

No publicly visible change, tests only.
Utility: open resource configuration files read-only.

The variable was const already, but this is even more hardened.
Utility: improve and test Resource compiler error reporting.
PluginManager: verify that instance is returned only from proper manager.

Currently fails. How could I forget to check this obviously dangerous
error?!
PluginManager: return instance only from proper manager.

The tests now pass again.
examples: fix compilation when Corrade is installed w/o WITH_FIND_MODULE.

The examples expected FindCorrade.cmake to be installed in system
location.
doc: crosslink examples with CMake macros documentation.

Also removed obsolete information from PluginManager example.
dox: fixed PluginManager example code listings.
examples: use Utility::Arguments in PluginManager example.

Makes everything more shiny and whatnot.
PluginManager: use Utility/Visibility.h instead of custom solution.
Utility: missing std::to_string() is MinGW32's fault.

Not Windows fault. Take this as first step to supporting MSVC :-)
Utility: broken std::u32string is also MinGW32's fault.
Use ninja also in all other development PKGBUILDs.
Containers: add test for Array::zeroInitialized().

Why did I not test that before?
Apparently CMake has variable for everything.