A* implementation

Working except for end of path endless loop (0,0 point appearing in paths for no reason?)

Commit mainly because the HDD is on the verge of dying

src/Level.h

@@ -25,7 +25,7 @@ public:
     void runStep();
 
 private:
-    const sf::Vector2i size;
+    const pro_maat::GridPos size;
 
     std::vector<Entity> entities;
 
@@ -37,7 +37,15 @@ private:
 
     std::vector<pro_maat::GridPos> occupiedSquares;
 
-    Orientation findPath(pro_maat::GridPos start, pro_maat::GridPos end, int sign);
+    /// If sign is +1, finds a path between start and goal positions.
+    /// If sign is -1, finds a path away from the goal position, from the starting position.
+    /// THIS DOES NOT HANDLE ENTITIES BIGGER THAN ONE SQUARE
+    ///
+    /// \param start Starting position
+    /// \param goal  Goal position
+    /// \param sign  +1 or -1, defines if we go towards or away from the goal
+    /// \return      Orientation of the next move if successful, Orientation::None otherwise.
+    Orientation findPath(pro_maat::GridPos start, pro_maat::GridPos goal, int sign);
 };