fix(icom): sidebands by name, model-aware controls, address 0x00

From an IC-7300 report, four faults and one addition.

USB and LSB could not be commanded at all: modeCode knew 'SSB' — which
resolves the sideband from the band — and answered 'unsupported mode' to
the sideband names themselves. So an operator wanting USB on 40 m had no
way to say it, from the console or from anywhere else. They are separate
buttons now, and a rig reporting the folded ADIF 'SSB' still lights the
side its frequency implies.

The console offered controls the radio does not have: ANT1/ANT2 on a rig
with one socket, and a PSK button every non-7610-class Icom NAKs. Both
now follow the model, as the band buttons and attenuator steps already
did. Mic gain stops being phone-only — on USB-D it still sets what the
radio transmits at, so an operator who lives in FT8 had none.

CI-V address 0x00 was refused by a 'n > 0' test and silently replaced by
the IC-7610 default; an EMPTY setting is what means unconfigured, so the
parse error decides now, not the value. Plus the 60 m band button that
was missing.

internal/cat/icomserial.go

@@ -1543,6 +1543,14 @@ func (b *IcomSerial) modeCode(mode string) (code byte, data bool, err error) {
 		return civ.ModeCW, false, nil
 	case "SSB":
 		return usb, false, nil
+	case "USB":
+		// The SIDEBAND, asked for by name. "SSB" resolves to whichever side the
+		// band convention wants, which is right for a logged mode and useless
+		// when the operator means "put this radio in USB" — on 40 m there was no
+		// way to say it at all, and the console's own button could not either.
+		return civ.ModeUSB, false, nil
+	case "LSB":
+		return civ.ModeLSB, false, nil
 	case "AM":
 		return civ.ModeAM, false, nil
 	case "FM":