Changed hashmap internals slightly, implemented dynamic hashmap growing

examples/hm_fill.c

@@ -0,0 +1,15 @@
+#include <stdio.h>
+#define LAZY_IMPL
+#include "../lazy.h"
+
+int main() {
+  Lz_HM(size_t,size_t) hm;
+  lz_hm_init(hm);
+  for (size_t i = 0; i < 384; ++i) {
+    lz_hm_add(hm, i, 2*i);
+  }
+
+  for (size_t i = 0; i < 384; ++i) {
+    printf("hm[%zu] = %zu\n", i, lz_hm_get(hm,i));
+  }
+}