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/QtCodeSnippet.h

@@ -37,6 +37,8 @@ public:
 
 	int lineNumberDigits() const;
 
+	void updateCodeSnippet(const CodeSnippetParams& params);
+
 	void updateLineNumberAreaWidthForDigits(int digits);
 	void updateContent();