Move parse tree stringification away from the main parsed statements, and into a helper function class.

repl/main.cpp

@@ -2,6 +2,7 @@
 #include <sstream>
 #include "../src/Parser/Lexer/Lexer.hpp"
 #include "../src/Parser/Parser.hpp"
+#include "../src/Parser/Statements/ParsedStatementStringifier.hpp"
 
 void UpdateScriptWithParseInfo(WINDOW* inputWindow, const std::u8string& script,
                                const MalachScript::Diagnostics::Diagnostic* diag,
@@ -82,7 +83,7 @@ void ParseAndUpdate(const std::vector<std::u8string> lines, WINDOW* diagnosticsW
     wclear(parsedWindow);
     if (logger.GetMessages().empty()) {
         std::stringstream ss;
-        parsedResult->Stringify(ss, "", true);
+        MalachScript::Parser::ParsedStatementStringifier::Stringify(parsedResult, ss, "", true);
 
         waddstr(parsedWindow, ss.str().c_str());
     }