Console alert options, audible and/or visible indicator

[adamyg]

Permit alternative alerts, beyond beep.

[adamyg]

build-225

[adamyg]

New features:

• Visible indicators <Invisible, Flash window or Flash baseline> [default = Invisible].

• Audible <on/off> [default = on].

                              +-------------------- Display bits -------------------+
                              | Input / display codepage:   [ UTF-8 ]               |
                              |-----------------------------------------------------|
                              |  Console alert mode          Other Options          |
                              |  ( ) Invisible               [x] Full 8 bits input  |
                              |  ( ) Flash window                                   |
                              |  (*) Flash baseline                                 |
                              |  [ ] Audible                                        |
                              |  [ ] Legacy beep                                    |
                              |-----------------------------------------------------|
                              |                 [< OK >] [ Cancel ]                 |
                              +-----------------------------------------------------+