Split vulkan_base into smaller units

Closes #30. This is a basic refactoring of the graphics module, so
everything won't be in single file.

graphics/rse_graphics.hpp

@@ -0,0 +1,31 @@
+#ifndef RSE_GRAPHICS_HPP
+#define RSE_GRAPHICS_HPP
+
+#include <cstdint>
+#include "src/vulkan_commons.hpp"
+
+namespace rse::graphics
+{
+class RseGraphics {
+    public:
+    RseGraphics();
+    RseGraphics& operator=(const RseGraphics&) = delete;
+    RseGraphics(const RseGraphics&) = delete;
+
+    /**
+     * @brief Initialize graphics module, runs main loop and deinits everything, when interrupted
+     *
+     * @return uint8_t 0 on success.
+     */
+    uint8_t graphics_run(void);
+
+    private:
+    /* Hold vulkan state. It is modified by function initializing and communicating with Vulkan API */
+    vulkanbase::VulkanState vulkan_state;
+};
+
+
+} // namespace rse::graphics
+
+
+#endif