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/Simplex3D.cpp

@@ -21,7 +21,7 @@ NzSimplex3D::NzSimplex3D()
             gradient3[i][j] = grad3Temp[i][j];
 }
 
-NzSimplex3D::NzSimplex3D(int seed) : NzSimplex3D()
+NzSimplex3D::NzSimplex3D(unsigned int seed) : NzSimplex3D()
 {
     this->SetNewSeed(seed);
     this->ShufflePermutationTable();