WIP: Added the initial process table implementation.

Wrote a basic process table implementation with CC's vectors and hash
maps. So far, it looks like it does not really work.

src/main.c

@@ -36,7 +36,7 @@ int main(int argc, char *argv[]) {
     exit(EXIT_FAILURE);
   }
 
-  ret = init_ui_socket("/home/fedir/.icfs-sock");
+  ret = init_ui_socket();
   if (ret != 0) {
     perror("init_ui_socket");
     exit(EXIT_FAILURE);
@@ -45,5 +45,6 @@ int main(int argc, char *argv[]) {
   ret = fuse_main(argc, argv, get_fuse_operations(), NULL);
 
   free(mountpoint);
+  destroy_ui_socket();
   return ret;
 }