fix cppcoreguidelines-*

* cppcoreguidelines-init-variables
* cppcoreguidelines-c-copy-assignment-signature
* cppcoreguidelines-macro-usage
* cppcoreguidelines-non-private-member-variables-in-classes
* cppcoreguidelines-pro-type-member-init
* cppcoreguidelines-slicing
* cppcoreguidelines-special-member-functions
* cppcoreguidelines-virtual-class-destructor

src/Base/UnitsSchemaImperial1.cpp

@@ -261,7 +261,7 @@ QString UnitsSchemaImperialBuilding::schemaTranslate(const Quantity& quant,
 
         // Process into string. Start with negative sign if quantity is less
         // than zero
-        char plusOrMinus;
+        char plusOrMinus {};
         if (quant.getValue() < 0) {
             output << "-";
             plusOrMinus = '-';