Terminal program for MailStation devices
1- Make `putchar` faster (probably just `stamp_char`) because it is currently
2 too slow to keep the modem at a high speed without dropping data. We may
3 be able to just get away with using flow control here if we can't make things
4 fast enough.
5
6- Add an actual Settings menu to change modem speed through DLAB, speaker
7 volume from automated calls, etc. This will require persisting settings to a
8 dataflash page somewhere.
9
10- Add a Call menu to dial saved phone numbers.
11
12- Maybe add battery level to status bar?