Remove ucore_ prefix from headers and source files

src/hash64int.c

@@ -0,0 +1,16 @@
+#include <stdint.h>
+#include "ucore/hash.h"
+
+uint64_t 
+uc_hash64shift(uint64_t key)
+{
+  key = (~key) + (key << 21); // key = (key << 21) - key - 1;
+  key = key ^ (key >> 24);
+  key = (key + (key << 3)) + (key << 8); // key * 265
+  key = key ^ (key >> 14);
+  key = (key + (key << 2)) + (key << 4); // key * 21
+  key = key ^ (key >> 28);
+  key = key + (key << 31);
+
+  return key;
+}