refactor: flatten app/ and util/ directory structure

targets/app/common/GameRules/LevelGeneration/LevelGenerators.cpp

@@ -0,0 +1,21 @@
+#include "LevelGenerators.h"
+
+#include <algorithm>
+
+#include "LevelGenerationOptions.h"
+
+LevelGenerators::LevelGenerators() {}
+
+void LevelGenerators::addLevelGenerator(const std::wstring& displayName,
+                                        LevelGenerationOptions* generator) {
+    if (!displayName.empty()) generator->setDisplayName(displayName);
+    m_levelGenerators.push_back(generator);
+}
+
+void LevelGenerators::removeLevelGenerator(LevelGenerationOptions* generator) {
+    std::vector<LevelGenerationOptions*>::iterator it;
+    while ((it = find(m_levelGenerators.begin(), m_levelGenerators.end(),
+                      generator)) != m_levelGenerators.end()) {
+        m_levelGenerators.erase(it);
+    }
+}