Function attach_color_buffer

	void CL_FrameBuffer::attach_color_buffer(
		int color_buffer,
		const CL_RenderBuffer & render_buffer);

	void CL_FrameBuffer::attach_color_buffer(
		int color_buffer,
		const CL_Texture & texture,
		int level = 0,
		int zoffset = 0);

	void CL_FrameBuffer::attach_color_buffer(
		int color_buffer,
		const CL_Texture & texture,
		CL_TextureSubtype  subtype,
		int level = 0,
		int zoffset = 0);