moved TowerUpgradePopop into its own file

include/render/gui/TowerUpgradePopup.h

@@ -0,0 +1,32 @@
+#pragma once
+
+#include "GuiWidget.h"
+
+#include "Defines.h"
+
+namespace td {
+namespace gui {
+
+class TowerUpgradePopup : public GuiWidget {
+private:
+	Vec2f m_ClickWorldPos;
+	bool m_ShouldBeClosed;
+	bool m_Opened;
+public:
+	TowerUpgradePopup(client::Client* client);
+
+	virtual void Render();
+
+	void SetClickPos(const Vec2f& worldPos);
+
+	bool IsPopupOpened();
+private:
+	static constexpr float m_TowerPopupTileWidth = 200.0f;
+	static constexpr float m_TowerPopupTileHeight = 200.0f;
+
+	static constexpr float m_PlaceTowerButtonWidth = 150.0f;
+	static constexpr float m_PlaceTowerButtonHeight = 35.0f;
+};
+
+} // namespace gui
+} // namespace td