Added code to get the consoles to be split into their own

Fixed issue where exiting a shell would not close the parent console properly
Changed the way the consoles are linked to the processes by making it a pointer to the console
Added all the console changes for the above
Added a slow maze drawing program similar to the c64 version

maze.c

@@ -0,0 +1,66 @@
+#include "types.h"
+#include "user.h"
+
+uint rngnumber(void)
+{
+  // Take from http://stackoverflow.com/questions/1167253/implementation-of-rand
+  static unsigned int z1 = 12345, z2 = 12345, z3 = 12345, z4 = 12345;
+  unsigned int b;
+  b  = ((z1 << 6) ^ z1) >> 13;
+  z1 = ((z1 & 4294967294U) << 18) ^ b;
+  b  = ((z2 << 2) ^ z2) >> 27; 
+  z2 = ((z2 & 4294967288U) << 2) ^ b;
+  b  = ((z3 << 13) ^ z3) >> 21;
+  z3 = ((z3 & 4294967280U) << 7) ^ b;
+  b  = ((z4 << 3) ^ z4) >> 12;
+  z4 = ((z4 & 4294967168U) << 13) ^ b;
+
+  return (z1 ^ z2 ^ z3 ^ z4) / 2;
+}
+
+int rngrange(int start, int end)
+{
+    if (end < start)
+    {
+        int swtmp = start;
+        start = end;
+        end = swtmp;
+    }
+
+    int range = end - start + 1;
+    return rngnumber() % (range) + start;
+}
+
+int main(int argc, char *argv[]) {
+    int lines = 1000;    
+        
+    for (int i = 1; i < argc; i++) {
+        if (strcmp(argv[i],  "-l") == 0) {
+            lines = atoi(argv[i + 1]);            
+        }
+    }
+
+    cls();
+    printf(1, "Start Maze\n");
+    for (int y = 0; y < lines; y++)
+    {        
+        for (int x = 0; x < 79; x++)
+        {
+            int rndnum = rngrange(189, 197);
+            switch (rndnum)
+            {
+            case 189:
+                rndnum = 179;
+                break;
+            case 190:
+                rndnum = 180;
+                break;
+            }
+            printf(1, "%c", rndnum);
+
+        }
+        printf(1, "\n");
+        sleep(10);
+    }
+    exit();
+}