ui: scope names in snippet titles

* added title for snippets
* title displays name of parent scope.
* when new TokenLocationFiles are created in the storage they are now returned as shared_ptr to ensure correct linking in the contained data.
* Storage::getTokenLocationsForLinesInFile() now always returns pairs of start and end locations.
* Adjusted code snippet view to regard the change described above.

src/lib/component/controller/CodeController.h

@@ -4,6 +4,7 @@
 #include <string>
 #include <map>
 
+#include "component/controller/helper/SnippetMerger.h"
 #include "component/controller/Controller.h"
 #include "component/view/CodeView.h"
 #include "utility/messaging/MessageListener.h"
@@ -14,10 +15,6 @@
 #include "utility/messaging/type/MessageShowFile.h"
 #include "utility/types.h"
 
-
-
-#include "component/controller/helper/SnippetMerger.h"
-
 class StorageAccess;
 class TokenLocationFile;
 
@@ -46,7 +43,7 @@ private:
 
 	std::vector<CodeView::CodeSnippetParams> getSnippetsForActiveTokenIds(
 		const std::vector<Id>& ids, Id declarationId) const;
-	std::vector<CodeView::CodeSnippetParams> getSnippetsForFile(const TokenLocationFile* file) const;
+	std::vector<CodeView::CodeSnippetParams> getSnippetsForFile(std::shared_ptr<TokenLocationFile> file) const;
 	std::shared_ptr<SnippetMerger> buildMergerHierarchy(
 		TokenLocation* location, SnippetMerger& fileScopedMerger, std::map<int, std::shared_ptr<SnippetMerger>>& mergers) const;