Updated versions and changelogs. Fixed missing yaml references in base resources for swagger-ui

plugins/channelrx/demodadsb/adsbplugin.cpp

@@ -30,7 +30,7 @@
 const PluginDescriptor ADSBPlugin::m_pluginDescriptor = {
     ADSBDemod::m_channelId,
     QString("ADS-B Demodulator"),
-    QString("4.20.0"),
+    QString("4.21.0"),
     QString("(c) Jon Beniston, M7RCE"),
     QString("https://github.com/f4exb/sdrangel"),
     true,

plugins/channelrx/freqtracker/freqtrackerplugin.cpp

@@ -28,7 +28,7 @@
 const PluginDescriptor FreqTrackerPlugin::m_pluginDescriptor = {
     FreqTracker::m_channelId,
 	QString("Frequency Tracker"),
-	QString("4.19.0"),
+	QString("4.21.0"),
 	QString("(c) Edouard Griffiths, F4EXB"),
 	QString("https://github.com/f4exb/sdrangel"),
 	true,

plugins/feature/gs232controller/gs232controllerplugin.cpp

@@ -30,7 +30,7 @@
 const PluginDescriptor GS232ControllerPlugin::m_pluginDescriptor = {
     GS232Controller::m_featureId,
     QString("GS-232 Rotator Controller"),
-    QString("4.20.0"),
+    QString("4.21.0"),
     QString("(c) Jon Beniston, M7RCE"),
     QString("https://github.com/f4exb/sdrangel"),
     true,

plugins/samplesink/usrpoutput/usrpoutputplugin.cpp

@@ -35,7 +35,7 @@
 const PluginDescriptor USRPOutputPlugin::m_pluginDescriptor = {
     QString("USRP"),
     QString("URSP Output"),
-    QString("4.19.0"),
+    QString("4.21.0"),
     QString("(c) Jon Beniston, M7RCE and Edouard Griffiths, F4EXB"),
     QString("https://github.com/f4exb/sdrangel"),
     true,

plugins/samplesource/usrpinput/usrpinputplugin.cpp

@@ -35,7 +35,7 @@
 const PluginDescriptor USRPInputPlugin::m_pluginDescriptor = {
     QString("USRP"),
     QString("USRP Input"),
-    QString("4.19.0"),
+    QString("4.21.0"),
     QString("(c) Jon Beniston, M7RCE and Edouard Griffiths, F4EXB"),
     QString("https://github.com/f4exb/sdrangel"),
     true,