Add FM mode improvements: NFM/FM filters, CTCSS, squelch; ADC and web settings

FM modulation:
- Replace 10 generic FM filter buttons with NFM (2.5kHz dev/11kHz BW) and FM
  (5.0kHz dev/16kHz BW); deviation applied to both RX and TX via WDSP
- Add FM squelch panel (SQL toggle + slider 0..100, per-band save/restore)
  with WDSP SetRXAFMSQRun/SetRXAFMSQThreshold (threshold = level/200.0)
- Add CTCSS panel with on/off toggle and custom flat-button tone picker popup
  (38 standard tones 67.0..250.3 Hz, default 67.0); tone selection and enable
  state saved per band via SetTXACTCSS*
- FM panels (SQL, CTCSS) shown only in FM mode, layout via RelayoutBelowBands
- PanelFilter height shrinks in FM mode so panels sit tight below filters
- FlatButton: handle CMTextChanged to invalidate on Caption change

ADC settings (Dither/Random):
- Add DitherEnabled/RandomEnabled to TGlobalSettings (default true)
- Pass as bitmask to ConfigureDDCs DDC Specific packet bytes 5/6
- Exposed in Settings → Advanced tab with live apply via ApplyADCSettings

Web server settings:
- Add TWebSettings (enabled, port, bind_addr, user, pass) stored globally
- WebServer: configurable port/bind IP via ParseIPv4; Reconfigure method
- Exposed in Settings → Advanced tab with live apply via ApplyWebSettings

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

HPSDRNetwork.pas

@@ -200,7 +200,8 @@ type
 
     procedure SendGeneralPacket(const Pkt: TGeneralPacket);
     procedure SendDDCSpecific(const Pkt: TDDCSpecificPacket);
-    procedure ConfigureDDCs(NumDDCs: Byte; SampleRate: Word; ADCSource: Byte = 0);
+    procedure ConfigureDDCs(NumDDCs: Byte; SampleRate: Word; ADCSource: Byte = 0;
+                            DitherEnabled: Boolean = True; RandomEnabled: Boolean = True);
     procedure SendDUCSpecific(const Pkt: TDUCSpecificPacket);
     procedure SendHighPriority(const Pkt: THighPriorityPacket);
     procedure SetRunAndFreq(Run: Boolean; DDC0FreqHz, DUCFreqHz: Double;
@@ -1266,7 +1267,8 @@ begin
 end;
 
 procedure THPSDRNetwork.ConfigureDDCs(NumDDCs: Byte; SampleRate: Word;
-                                      ADCSource: Byte);
+                                      ADCSource: Byte;
+                                      DitherEnabled: Boolean; RandomEnabled: Boolean);
 var
   Pkt:     TDDCSpecificPacket;
   i, ddc:  Integer;
@@ -1280,6 +1282,12 @@ begin
   else
     Pkt.NumADCs := 1;
 
+  // Dither/Random — биты 0..NumADCs-1 (один бит на ADC)
+  if DitherEnabled then
+    Pkt.DitherADC := (1 shl Pkt.NumADCs) - 1;
+  if RandomEnabled then
+    Pkt.RandomADC := (1 shl Pkt.NumADCs) - 1;
+
   // Для ANGELIA/ORION/ORION2/SATURN DDC начинается с индекса 2 (DDC0/1 — PureSignal)
   // Для HERMES/HL2 — с 0
   if FDevice.BoardType in [3, 4, 5, 10] then  // ANGELIA=3, ORION=4, ORION2=5, SATURN=10