Minor fixes

*Seed is uint instead of int
*Permutation table is uint instead of int, could lead before to program
crash with negative seeds


Former-commit-id: 49ad04987a09a5f5b4bcab6ee3916db9818172b6

include/Nazara/Noise/Simplex2D.hpp

@@ -16,7 +16,7 @@ class NAZARA_API NzSimplex2D : public NzAbstract2DNoise
 {
     public:
         NzSimplex2D();
-        NzSimplex2D(int seed);
+        NzSimplex2D(unsigned int seed);
         float GetValue(float x, float y, float resolution);
         virtual ~NzSimplex2D() = default;
     protected: