logic: lazy load code annotations

* code annotations are loaded after showing the code file
* added traces
* refactored highlighter
* fixed error tooltip style in codeview

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src/lib_gui/qt/element/QtCodeNavigator.h

@@ -43,6 +43,7 @@ public:
 	virtual ~QtCodeNavigator();
 
 	void addCodeSnippet(const CodeSnippetParams& params);
+	void updateCodeSnippet(const CodeSnippetParams& params);
 	void addFile(std::shared_ptr<SourceLocationFile> locationFile, int refCount, TimeStamp modificationTime);
 
 	void addedFiles();