ui: snippet sizes

* added SnippetMerger class that conducts the merging and snapping of TokenLocations to create snippets.
* added parameters for snippet snapping and merging to ApplicationSettings.
* added forEachStartTokenLocation() and forEachEndTokenLocation() to TokenLocationLine and TokenLocationFile.
* added < and > operators to TokenLocation that compare the location part (not the id).

src/lib/data/access/StorageAccessProxy.cpp

@@ -153,3 +153,13 @@ TokenLocationCollection StorageAccessProxy::getErrorTokenLocations(std::vector<s
 
 	return TokenLocationCollection();
 }
+
+std::shared_ptr<TokenLocationFile> StorageAccessProxy::getTokenLocationOfParentScope(const TokenLocation* child) const
+{
+	if (hasSubject())
+	{
+		return m_subject->getTokenLocationOfParentScope(child);
+	}
+
+	return std::make_shared<TokenLocationFile>("");
+}