Add Costas Loop PLL in Channel Analyzer

Add loop bandwidth and other PLL controls to Channel Analyzer GUI.
Fix bug where PLL lock frequency would be incorrect by the decimation
factor.

sdrbase/resources/webapi/doc/swagger/include/ChannelAnalyzer.yaml

@@ -23,6 +23,9 @@ ChannelAnalyzerSettings:
     fll:
       description: Boolean
       type: integer
+    costasLoop:
+      description: Boolean
+      type: integer
     rrc:
       description: Boolean
       type: integer
@@ -31,6 +34,15 @@ ChannelAnalyzerSettings:
       type: integer
     pllPskOrder:
       type: integer
+    pllBandwidth:
+      type: number
+      format: float
+    pllDampingFactor:
+      type: number
+      format: float
+    pllLoopGain:
+      type: number
+      format: float
     inputType:
       description: see ChannelAnalyzerSettings::InputType
       type: integer