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.

vm/inst.c

@@ -187,30 +187,6 @@ void data_print(data_t datum, data_type_t type, FILE *fp)
   }
 }
 
-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;
-}
-
 void inst_print(inst_t instruction, FILE *fp)
 {
   static_assert(NUMBER_OF_OPCODES == 46, "inst_bytecode_size: Out of date");