Add save/loadAllObjects to object settings API

Looping through the vectors was done for almost all vectors
individually. Because there are some weird off by one issues that could
crop up it's easier to just have a function for it.

src/settings/settings_object.h

@@ -91,6 +91,54 @@ void loadObject( ISettingsObject& obj );
  */
 void saveNumberedObject( const ISettingsObject& obj, const int slot );
 
+/*!
+   \brief Saves \a vec of \c ISettingsObject.
+   \param vec Vector of \c ISettingsObject derived objects.
+
+   Saves the objects starting from \c slot 1 to \c slot \c{1 + vec.size()}.
+*/
+template <class T> void saveAllObjects( const std::vector<T> vec )
+{
+    static_assert(
+        std::is_base_of<ISettingsObject, T>::value,
+        "Only objects that inherit from ISettingsObject can be saved." );
+
+    auto i = 1;
+    for ( auto& p : vec )
+    {
+        saveNumberedObject( p, i );
+        ++i;
+    }
+}
+
+/*!
+   \brief Loads \a vec of \c ISettingsObject.
+   \param vec Vector of \c ISettingsObject derived objects.
+
+   Loads the objects starting from \c slot 1 to the last contiguous object.
+*/
+template <class T> void loadAllObjects( std::vector<T>& vec )
+{
+    static_assert(
+        std::is_base_of<ISettingsObject, T>::value,
+        "Only objects that inherit from ISettingsObject can be loaded." );
+
+    vec.clear();
+
+    // We'll need to know which name the object is saved under.
+    // We could check vec.at(0), but it's not guaranteed to exist.
+    auto o = T{};
+    auto profileCount = getAmountOfSavedObjects( o );
+    for ( int profileNumber = 1; profileNumber < profileCount; ++profileNumber )
+    {
+        vec.emplace_back();
+
+        const auto index = static_cast<size_t>( profileNumber - 1 );
+
+        loadNumberedObject( vec.at( index ), profileNumber );
+    }
+}
+
 /*!
    \brief Loads \a obj from permanent storage in a numbered \a slot.
    \param obj Object to load.