Utility: add TODO to NaClConsoleStreamBuffer line-by-line.

It's probably NaCl issue, as calling `console.log()` directly in
Chromium doesn't truncate anything.
Fixed linker errors when building tests on Windows.
Utility: Directory::join() now works with drive letters on Windows.

And Windows only, as path "C:/Users" is not absolute anywhere else.
Utility: install also test lib on Windows.

Resolves DLL hell when running tests.
PluginManager: cleanup CORRADE_PLUGIN_EXPORT macro.

Might (hopefully) solve some problems on Windows.
GCC 4.5 compatibility: this is not needed anymore.
Wrap CMAKE_SHARED_LIBRARY_CXX_FLAGS in quotes.

The variable is empty on some platforms (Windows), would cause issues.
Don't use `this->` when it's not explicitly necessary.

Makes code more readable and less ambiguous.
Merge branch 'master' into compatibility