Remove Qt modules which we won't be needing (most notably QtDeclarative) from the build. TODO: Ubuntu and OSX deps script needs to be adjusted too.
OgreModuleFwd.h: add using OgreRenderer::OgreRenderingModule; typedef OgreRenderer::RendererPtr OgreRendererPtr; and typedef OgreRenderer::RendererWeakPtr OgreRendererWeakPtr; so that we don't need to use the horrendous full qualifiers.