add app.get_content_sources, app.set_content_sources

src/content/PacksManager.cpp

@@ -9,6 +9,10 @@
 
 PacksManager::PacksManager() = default;
 
+const std::vector<io::path>& PacksManager::getSources() const {
+    return sources;
+}
+
 void PacksManager::setSources(std::vector<io::path> sources) {
     this->sources = std::move(sources);
 }