build: fix compiler and cmake warnings

added missing virtual destructor
fixed a warning in token.h: expression with side effects will be evaluated despite being used as an operand to 'typeid'
CMP00043 Cmake warning
added missing override keyword

src/lib/utility/file/FileManager.h

@@ -11,7 +11,7 @@ class FileManager
 {
 public:
 	FileManager();
-	~FileManager();
+	virtual ~FileManager();
 
 	const std::vector<FilePath>& getSourcePaths() const;
 	const std::vector<FilePath>& getIncludePaths() const;