[Companion] Radio profile/current firmware handling: (#4737)

* Fix possible confusion/data corruption when deleting radio profile (closes #4734, ref: #4686);
    * Add Delete Profile action to Radio Profiles menu (closes #4736) (but remove from from app prefs. panel);
    * Add confirmation prompt before deleting profile;
    * Open profile settings dialog when creating/copying a profile (closes #4735);
    * Make sure current (global) firmware flavor is properly updated when changing fw type/options in profile;
    * Append "-Copy" to name of copied profile;
    * Factor out Firmware global vars/functions in favor of static members.

companion/src/eeprominterface.cpp

@@ -239,7 +239,7 @@ RawSourceRange RawSource::getRange(const ModelData * model, const GeneralSetting
 {
   RawSourceRange result;
 
-  Firmware * firmware = getCurrentFirmware();
+  Firmware * firmware = Firmware::getCurrentVariant();
   int board = firmware->getBoard();
   bool singleprec = (flags & RANGE_SINGLE_PRECISION);
 
@@ -912,7 +912,7 @@ QString CustomFunctionData::funcToString() const
 void CustomFunctionData::populateResetParams(const ModelData * model, QComboBox * b, unsigned int value = 0)
 {
   int val = 0;
-  Firmware * firmware = getCurrentFirmware();
+  Firmware * firmware = Firmware::getCurrentVariant();
   Board::Type board = firmware->getBoard();
 
   b->addItem(QObject::tr("Timer1"), val++);
@@ -1138,7 +1138,7 @@ GeneralSettings::GeneralSettings()
     calibSpanPos[i] = 0x180;
   }
 
-  Firmware * firmware = getCurrentFirmware();
+  Firmware * firmware = Firmware::getCurrentVariant();
   Board::Type board = firmware->getBoard();
 
   for (int i=0; i<getBoardCapability(board, Board::FactoryInstalledSwitches); i++) {
@@ -1735,10 +1735,6 @@ void unregisterEEpromInterfaces()
   OpenTxEepromCleanup();
 }
 
-QList<Firmware *> firmwares;
-Firmware * default_firmware_variant;
-Firmware * current_firmware_variant;
-
 void ShowEepromErrors(QWidget *parent, const QString &title, const QString &mainMessage, unsigned long errorsFound)
 {
   std::bitset<NUM_ERRORS> errors((unsigned long long)errorsFound);
@@ -1790,16 +1786,22 @@ void ShowEepromWarnings(QWidget *parent, const QString &title, unsigned long err
   msgBox.exec();
 }
 
-Firmware * getFirmware(const QString & id)
+// static
+QVector<Firmware *> Firmware::registeredFirmwares;
+Firmware * Firmware::defaultVariant = NULL;
+Firmware * Firmware::currentVariant = NULL;
+
+// static
+Firmware * Firmware::getFirmwareForId(const QString & id)
 {
-  foreach(Firmware * firmware, firmwares) {
+  foreach(Firmware * firmware, registeredFirmwares) {
     Firmware * result = firmware->getFirmwareVariant(id);
     if (result) {
       return result;
     }
   }
 
-  return default_firmware_variant;
+  return defaultVariant;
 }
 
 void Firmware::addOption(const char *option, QString tooltip, uint32_t variant)