filepath: Added clear and isEmpty methods.

include/bx/filepath.h

@@ -56,6 +56,9 @@ namespace bx
 		///
 		FilePath& operator=(const StringView& _rhs);
 
+		///
+		void clear();
+
 		///
 		void set(Dir::Enum _dir);
 
@@ -87,6 +90,9 @@ namespace bx
 		///
 		bool isAbsolute() const;
 
+		///
+		bool isEmpty() const;
+
 	private:
 		char m_filePath[kMaxFilePath];
 	};