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.
vk7js