feat(elecraft): the rest of the main controls on the K3/K4 console

So the tester can exercise everything in one session instead of one
control per build: RF and mic gain, squelch, preamp, attenuator, NB, NR,
AGC, filter width, antenna, RIT/XIT with a clear, and the keyer speed.

The analogue scales differ between an Elecraft and a Kenwood — RF gain
000-250, mic 000-060, squelch 000-029 against 0-255 — so each is mapped
through its own full scale and shown as a percentage. Using one rig's
range on the other silently halves or doubles every setting.

Antenna only appears when the radio answers AN: a K3 without the internal
ATU has one socket, and a switch that goes nowhere is worse than none.

app_k3.go

@@ -32,6 +32,60 @@ func (a *App) SetKenwoodAFGain(p int) error {
 	return a.kenwoodPanelDo(func(k cat.KenwoodPanelController) error { return k.SetKenwoodAFGain(p) })
 }
 
+func (a *App) SetKenwoodRFGain(p int) error {
+	return a.kenwoodPanelDo(func(k cat.KenwoodPanelController) error { return k.SetKenwoodRFGain(p) })
+}
+
+func (a *App) SetKenwoodMicGain(p int) error {
+	return a.kenwoodPanelDo(func(k cat.KenwoodPanelController) error { return k.SetKenwoodMicGain(p) })
+}
+
+func (a *App) SetKenwoodSquelch(p int) error {
+	return a.kenwoodPanelDo(func(k cat.KenwoodPanelController) error { return k.SetKenwoodSquelch(p) })
+}
+
+func (a *App) SetKenwoodPreamp(on bool) error {
+	return a.kenwoodPanelDo(func(k cat.KenwoodPanelController) error { return k.SetKenwoodPreamp(on) })
+}
+
+func (a *App) SetKenwoodAtt(on bool) error {
+	return a.kenwoodPanelDo(func(k cat.KenwoodPanelController) error { return k.SetKenwoodAtt(on) })
+}
+
+func (a *App) SetKenwoodNB(on bool) error {
+	return a.kenwoodPanelDo(func(k cat.KenwoodPanelController) error { return k.SetKenwoodNB(on) })
+}
+
+func (a *App) SetKenwoodNR(on bool) error {
+	return a.kenwoodPanelDo(func(k cat.KenwoodPanelController) error { return k.SetKenwoodNR(on) })
+}
+
+func (a *App) SetKenwoodAGC(name string) error {
+	return a.kenwoodPanelDo(func(k cat.KenwoodPanelController) error { return k.SetKenwoodAGC(name) })
+}
+
+func (a *App) SetKenwoodFilter(hz int) error {
+	return a.kenwoodPanelDo(func(k cat.KenwoodPanelController) error { return k.SetKenwoodFilter(hz) })
+}
+
+func (a *App) SetKenwoodAntenna(n int) error {
+	return a.kenwoodPanelDo(func(k cat.KenwoodPanelController) error { return k.SetKenwoodAntenna(n) })
+}
+
+func (a *App) SetKenwoodRIT(on bool) error {
+	return a.kenwoodPanelDo(func(k cat.KenwoodPanelController) error { return k.SetKenwoodRIT(on) })
+}
+
+func (a *App) SetKenwoodXIT(on bool) error {
+	return a.kenwoodPanelDo(func(k cat.KenwoodPanelController) error { return k.SetKenwoodXIT(on) })
+}
+
+// ClearKenwoodRIT zeroes the RIT and XIT offsets together, which is what the
+// radio's own RC does and what an operator means by "clear it".
+func (a *App) ClearKenwoodRIT() error {
+	return a.kenwoodPanelDo(func(k cat.KenwoodPanelController) error { return k.ClearKenwoodRIT() })
+}
+
 // SetKenwoodTX is the panel's MOX.
 func (a *App) SetKenwoodTX(on bool) error {
 	return a.kenwoodPanelDo(func(k cat.KenwoodPanelController) error { return k.SetKenwoodTX(on) })