[libcalamaresui] Remove the requiredModules setting

- The value set in module.desc was never stored for use,
   but isn't an attribute of the instance, either. It belongs
   with the descriptor, in ModuleManager.

src/libcalamaresui/modulesystem/Module.cpp

@@ -224,13 +224,6 @@ Module::instanceKey() const
 }
 
 
-QStringList
-Module::requiredModules() const
-{
-    return m_requiredModules;
-}
-
-
 QString
 Module::location() const
 {
@@ -286,7 +279,6 @@ void
 Module::initFrom( const QVariantMap& moduleDescriptor )
 {
     m_name = moduleDescriptor.value( "name" ).toString();
-
     if ( moduleDescriptor.contains( EMERGENCY ) )
         m_maybe_emergency = moduleDescriptor[ EMERGENCY ].toBool();
 }

src/libcalamaresui/modulesystem/Module.h

@@ -106,13 +106,6 @@ public:
      */
     virtual QString instanceKey() const final;
 
-    /**
-     * @brief requiredModules a list of names of modules required by this one.
-     * @return the list of names.
-     * The module dependencies system is currently incomplete and unused.
-     */
-    virtual QStringList requiredModules() const;
-
     /**
      * @brief location returns the full path of this module's directory.
      * @return the path.
@@ -198,7 +191,6 @@ private:
     void loadConfigurationFile( const QString& configFileName ); //throws YAML::Exception
 
     QString m_name;
-    QStringList m_requiredModules;
     QString m_directory;
     QString m_instanceId;