Replace mwscript program serialization into a vector with simple struct

Mostly to avoid string literal lookup by index with iteration over all preciding
literals and calling strlen. This is very inefficient. In genral this makes code
much more straightforward but also makes it portable since now int and float of
different sizes are properly supported.

components/compiler/scriptparser.hpp

@@ -23,8 +23,7 @@ namespace Compiler
         /// \param end of script is marked by end keyword.
         ScriptParser(ErrorHandler& errorHandler, const Context& context, Locals& locals, bool end = false);
 
-        void getCode(std::vector<Interpreter::Type_Code>& code) const;
-        ///< store generated code in \a code.
+        Interpreter::Program getProgram() const;
 
         bool parseName(const std::string& name, const TokenLoc& loc, Scanner& scanner) override;
         ///< Handle a name token.