Add depth buffer

- Add depth testing to swapchain
- Add Shader abstraction
- Add CommandBuffer abstraction

Vulkan/src/CommandBufferScoped.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include "Common.h"
+#include "CommandBuffer.h"
+
+class CommandBufferScoped : public CommandBuffer
+{
+  CP_DELETE_COPY_AND_MOVE_CTOR(CommandBufferScoped);
+public:
+  CommandBufferScoped(Instance& instance)
+    : CommandBuffer{instance, CommandBufferType::SingleUse}
+  {
+    CommandBuffer::Begin();
+  }
+
+  ~CommandBufferScoped()
+  {
+    CommandBuffer::End();
+    CommandBuffer::Submit();
+  }
+};