Moved base functions from inst.c to dedicated file

Doesn't make sense for them to be in the VM module when they have a
more general purpose now.

lib/base.c

@@ -0,0 +1,39 @@
+/* Copyright (C) 2023 Aryadev Chavali
+
+ * You may distribute and modify this code under the terms of the
+ * GPLv2 license.  You should have received a copy of the GPLv2
+ * license with this file.  If not, please write to:
+ * aryadev@aryadevchavali.com.
+
+ * Created: 2023-10-26
+ * Author: Aryadev Chavali
+ * Description: Implementation of basic library functions
+ */
+
+#include <string.h>
+
+#include "./base.h"
+
+hword convert_bytes_to_hword(byte *bytes)
+{
+  hword h = 0;
+  memcpy(&h, bytes, HWORD_SIZE);
+  return h;
+}
+
+void convert_hword_to_bytes(hword w, byte *bytes)
+{
+  memcpy(bytes, &w, HWORD_SIZE);
+}
+
+void convert_word_to_bytes(word w, byte *bytes)
+{
+  memcpy(bytes, &w, WORD_SIZE);
+}
+
+word convert_bytes_to_word(byte *bytes)
+{
+  word w = 0;
+  memcpy(&w, bytes, WORD_SIZE);
+  return w;
+}