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

src/Nazara/Noise/Simplex4D.cpp

@@ -45,7 +45,7 @@ NzSimplex4D::NzSimplex4D()
             gradient4[i][j] = grad4Temp[i][j];
 }
 
-NzSimplex4D::NzSimplex4D(int seed) : NzSimplex4D()
+NzSimplex4D::NzSimplex4D(unsigned int seed) : NzSimplex4D()
 {
     this->SetNewSeed(seed);
     this->ShufflePermutationTable();