The ][ doesn't have lower case but the //e defaults to lower case so we need to allow both upper case and lower case (and convert to lower case before DNS lookup).
- The C64 variant already used get_key and I don't see a reason why the A2 has different requirements when it comes to the question when it is necessary to call ip65_process.
- On the A2 get_key does display a cursor while get_key_ip65 does not. However get_filtered_input is used to get a string of characters. This is exactly the scenario asking for a cursor.
The pretty small check_for_abort_key is used by DHCP and DNS which means it is used by about every IP65 program. The pretty large get_filtered_input on the other hand is very seldom used so it makes sense to put the latter in a separate module to keep it from ending up in binaries unused.
