drop const in TextLoader line pointer

src/core/TextLoader.h

@@ -33,7 +33,7 @@ public:
     auto begin() { return m_lines->begin(); }
     auto end() { return m_lines->end(); }
 
-    typedef std::pair<const uint8_t *, uint32_t> LineIndexPair;
+    typedef std::pair<uint8_t *, uint32_t> LineIndexPair;
     typedef std::list<LineIndexPair> LineIndexPairList;
     typedef std::shared_ptr<LineIndexPairList> LineIndexPairListRef;