Add love.math.isConvex()

Checks whether a given polygon is convex or not.

src/modules/math/MathModule.h

@@ -108,6 +108,14 @@ public:
 	 **/
 	std::vector<Triangle> triangulate(const std::vector<vertex> &polygon);
 
+	/**
+	 * Checks whether a polygon is convex.
+	 *
+	 * @param polygon Polygon to test.
+	 * @return True if the polygon is convex, false otherwise.
+	 **/
+	bool isConvex(const std::vector<vertex> &polygon);
+
 	/**
 	 * Calculate Simplex noise for the specified coordinate(s).
 	 *