Firmware options refactoring. It allows

FirmwareInterface::getCapability() to know which options are enabled in
the preferences. The Heli tab and the GVars are displayed according to
these options.

companion/src/mdichild.cpp

@@ -401,7 +401,7 @@ bool MdiChild::saveFile(const QString &fileName, bool setCurrent)
     int eeprom_size = 0;
 
     if (fileType != FILE_TYPE_XML) {
-      eeprom_size = GetEepromInterface()->save(eeprom, radioData, GetCurrentFirmwareVariant(), 0/*last version*/);
+      eeprom_size = GetEepromInterface()->save(eeprom, radioData, GetCurrentFirmware()->getVariantNumber(), 0/*last version*/);
       if (!eeprom_size) {
         QMessageBox::warning(this, tr("Error"),tr("Cannot write file %1:\n%2.").arg(myFile).arg(file.errorString()));
         return false;