Resolve "Mehrere Fenster, Abhängigkeiten von Core zu Fenster+Swapchain etc"

Closes #89 (closed)

src/vkcv/Core.cpp

@@ -57,6 +57,8 @@ namespace vkcv
             m_PassManager{std::make_unique<PassManager>(m_Context.m_Device)},
             m_PipelineManager{std::make_unique<PipelineManager>(m_Context.m_Device)},
             m_DescriptorManager(std::make_unique<DescriptorManager>(m_Context.m_Device)),
+			m_WindowManager(std::make_unique<WindowManager>()),
+			m_SwapchainManager(std::make_unique<SwapchainManager>()),
             m_BufferManager{std::unique_ptr<BufferManager>(new BufferManager())},
             m_SamplerManager(std::unique_ptr<SamplerManager>(new SamplerManager(m_Context.m_Device))),
             m_ImageManager{std::unique_ptr<ImageManager>(new ImageManager(*m_BufferManager))},