Created the TileSheet class

This is incomplete on it's own, but used as part of the whole map system,
it should work well. This class keeps track of various, seemingly
unrelated states, which are used as part of the larger map system.

Also, fixed Region's members being public.

editor/tile_sheet.hpp

@@ -0,0 +1,55 @@
+#ifndef TILESHEET_HPP_
+#define TILESHEET_HPP_
+
+#include "image.hpp"
+
+#include <string>
+
+/* The TileSheet class is used for drawing tiles of the map to the screen.
+ * This class also has some code to allow the management of several TileSheets,
+ * namely the index, begin & end members, tracking of the tile indexes, and
+ * custom wrapper functions.
+*/
+class TileSheet {
+public:
+	TileSheet() = default;
+	~TileSheet() = default;
+
+	//these load/set functions need to be followed by bookkeeping code
+	//w & h are the width & height of individual tiles
+	SDL_Surface* LoadSurface(std::string fname, Uint16 w, Uint16 h);
+	SDL_Surface* SetSurface(SDL_Surface* const, Uint16 w, Uint16 h);
+	SDL_Surface* GetSurface();
+	void FreeSurface();
+
+	void DrawTo(SDL_Surface* const dest, int x, int y, int tileIndex);
+
+	bool InRange(int i) { return i >= begin && i < end; }
+
+	//accessors and mutators
+	Image* GetImage() { return &image; }
+
+	std::string SetName(std::string s) { return name = s; }
+	std::string GetName() const { return name; }
+
+	int GetTotalCount() const { return totalCount; }
+	int GetXCount() const { return xCount; }
+	int GetYCount() const { return yCount; }
+
+	int SetIndex(int i) { return index = i; }
+	int SetBegin(int i) { return begin = i; }
+	int SetEnd(int i) { return end = i; }
+
+	int GetIndex() const { return index; }
+	int GetBegin() const { return begin; }
+	int GetEnd() const { return end; }
+private:
+	Image image;
+	std::string name;
+
+	//these are generated and used by internal processes
+	int totalCount = 0, xCount = 0, yCount = 0;
+	int index = -1, begin = -1, end = -1;
+};
+
+#endif