Function latch will play high beep when latched and low beep when latch times out.
Menus will play a high beep when you arrow through them and a low beep when you reach the first item.
All keys should play a generic beep sound but this has not been implemented yet.
1. Added vp_announceBuffer to speak a prompt, edit mode and string buffer.
2. Added logic to the vp_announceScreen for m17Settings read-only mode.
3. Added logic for handling edit mode.
4. Removed vpCaps flag from several places because it is irrelevant when input only supports caps.
Removed flag parameters from summary and GPSInfo,
hooked up the GPS info so that if the GPS screen is active,
long hold f1 will read the GPS summary and f1 will repeat the last
voice prompt like on the VFO and channel screens.
Implemented the three levels of verbosity, besides none and beep:
1. Low: menus will speak but frequency and channel changes will just beep.
2. Medium: everything will speak but extra descriptions are eliminated except where ambiguity might occur.
3. High: Like medium except extra descriptions are spoken unles rapidly keying through menus in which case only the value will be spoken.
Added calls to various voice prompt functions in the UI so that VFO is basically accessible.
1. When entering digits in VFO mode.
2. When digits exceed 3, point will be announced.
3. When user enters sufficient digits to move from RX field to TX field, or if user presses Enter to move to TX field.
4. When both rx and tx frequencies have been completed.
Began calling voice prompt utility functions from places such as:
1. arrowing up and down in VFO mode (read new frequencies)
2. up and down in memory mode: read new channel name.
3. up and down in VFO input mode: announce receive or transmit,
4. when starting to enter a frequency: announce receive and the first digit.
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