Utility: Rework cursors

-Rename WindowCursor to SystemCursor
-Merged Cursor class with SystemCursor enum

include/Nazara/Utility/Cursor.inl

@@ -3,15 +3,30 @@
 // For conditions of distribution and use, see copyright notice in Config.hpp
 
 #include <Nazara/Utility/Cursor.hpp>
+#include <Nazara/Core/ErrorFlags.hpp>
 #include <Nazara/Utility/Debug.hpp>
 
 namespace Nz
 {
 	inline Cursor::Cursor() :
-	m_impl(nullptr)
+	m_impl(nullptr),
+	m_usesSystemCursor(false)
 	{
 	}
 
+	inline Cursor::Cursor(SystemCursor systemCursor) :
+	Cursor()
+	{
+		ErrorFlags flags(ErrorFlag_ThrowException, true);
+		Create(systemCursor);
+	}
+
+	inline Cursor::Cursor(Cursor&& cursor) noexcept :
+	Cursor()
+	{
+		operator=(std::move(cursor));
+	}
+
 	inline Cursor::~Cursor()
 	{
 		Destroy();
@@ -19,13 +34,36 @@ namespace Nz
 
 	inline const Image& Cursor::GetImage() const
 	{
+		NazaraAssert(IsValid(), "Invalid cursor");
+		NazaraAssert(!m_usesSystemCursor, "System cursors have no image");
+
 		return m_cursorImage;
 	}
 
+	inline SystemCursor Cursor::GetSystemCursor() const
+	{
+		NazaraAssert(IsValid(), "Invalid cursor");
+		NazaraAssert(m_usesSystemCursor, "Custom cursor uses an image");
+
+		return m_systemCursor;
+	}
+
 	inline bool Cursor::IsValid() const
 	{
 		return m_impl != nullptr;
 	}
+
+	inline Cursor& Cursor::operator=(Cursor&& cursor)
+	{
+		m_cursorImage = std::move(cursor.m_cursorImage);
+		m_systemCursor = cursor.m_systemCursor;
+		m_impl = cursor.m_impl;
+		m_usesSystemCursor = cursor.m_usesSystemCursor;
+
+		cursor.m_impl = nullptr;
+
+		return *this;
+	}
 }
 
 #include <Nazara/Utility/DebugOff.hpp>