Update 4x4 dice and add 6x6 dice

dice_4x4.csv

@@ -1,17 +1,17 @@
 # front,right,back,left,top,bottom (start with 'one of' the first alphabetical chars
-a,h,s,p,o,c
-e,r,l,i,x,d
-a,g,a,e,e,a
-e,y,t,l,r,t
-e,o,t,s,s,i
-d,r,y,v,l,e
-h,n,l,n,z,r
-e,r,w,t,v,h
-h,i,u,n,m,qu
-e,e,h,n,w,g 
-d,t,y,t,i,s
-a,b,b,o,o,j
-e,i,u,n,s,e
-a,s,p,f,k,f 
-c,m,u,o,i,t 
+a,a,a,e,e,g
+a,b,b,j,o,o
+a,c,h,o,p,s
+a,f,f,k,p,s
 a,w,t,o,o,t
+c,i,m,o,t,u
+d,e,i,l,r,x
+d,e,l,r,v,y
+d,i,s,t,t,y
+e,e,g,h,n,w
+e,e,i,n,s,u
+e,h,r,t,v,w
+e,i,o,s,s,t
+e,l,r,t,t,y
+h,i,m,n,qu,u
+h,l,n,n,r,z