SSB/SSB+DATA: Add button to toggle between hi_lo and shift_width modes

[tonyc]

Add a button to the left of the A/B/C IF filter buttons in SSB or SSB DATA modes to easily set the hi+low / shift+width modes.

SSB mode: EX00611 001 sets shift+width, EX00611 000 sets hi+low cut.
SSB data: EX00612 001 sets shift+width, EX00612 000 sets hi+low cut.

[Tyrbiter]

Not sure if the changes in fw 1.0.5 have affected this. Item 1 suggests this is relevant, items 3 and 4 may also be in other situations.

Updated items : (Version 1.04 => 1.05) [September 25, 2023]
The following features are updated.

1. Changes the default value of the Menu No.6-12 "Filter Control in SSB-DATA Mode (High/Low and Shift/Width)" from "Shift & Width" to "High & Low Cut".
2. Changes the default value of the Clock Menu No.1-01 "NTP Server Address" from "Blank" to "time.nist.gov".
3. Stores the bandscope span frequency separately for SSB/AM/FM mode, CW/FSK/PSK mode, and DATA mode.
4. Stores the bandscope marker shift position separately for SSB/AM/FM mode, CW/FSK/PSK mode, and DATA mode.
   *Please also refer to the revised Instruction Manuals.