Base: simplify UnitsSchemas management

Fixes: Maintaining schemas is difficult and error-prone

- Facilitate easy schemas add, remove, change, etc.
- Remove 14 files containing approx 2,190 lines of if/else code and data
- Place data in one file (UnitsSchemasData.h) using a normalized structure (including special functions)
- Isolate and simplify data operations (code)
- Remove schemas enum to keep data independent of code
- Separate responsibilities: Specifications, data, schemas, schema
- Add schema data 'isDefault'
- Add schema data name
- Prefer algorithms to raw loops
- Add schemas unit tests
- Tweak quantity unit tests

src/App/Application.cpp

@@ -2795,12 +2795,10 @@ void Application::initApplication()
     // set up Unit system default
     const ParameterGrp::handle hGrp = GetApplication().GetParameterGroupByPath
        ("User parameter:BaseApp/Preferences/Units");
-    Base::UnitsApi::setSchema(static_cast<Base::UnitSystem>(hGrp->GetInt("UserSchema", 0)));
-    Base::UnitsApi::setDecimals(static_cast<int>(hGrp->GetInt("Decimals", Base::UnitsApi::getDecimals())));
-
-    // In case we are using fractional inches, get user setting for min unit
-    const int denom = static_cast<int>(hGrp->GetInt("FracInch", Base::QuantityFormat::getDefaultDenominator()));
-    Base::QuantityFormat::setDefaultDenominator(denom);
+    Base::UnitsApi::setSchema(hGrp->GetInt("UserSchema", Base::UnitsApi::getDefSchemaNum()));
+    Base::UnitsApi::setDecimals(hGrp->GetInt("Decimals", Base::UnitsApi::getDecimals()));
+    Base::QuantityFormat::setDefaultDenominator(
+        hGrp->GetInt("FracInch", Base::QuantityFormat::getDefaultDenominator()));
 
 #if defined (_DEBUG)
     Base::Console().Log("Application is built with debug information\n");