Move custom script parser to its own function

scriptclass::load() is a large enough function as it is, we don't need
any more trouble by shoving the custom script parser in there as well.

desktop_version/src/Script.h

@@ -37,6 +37,8 @@ public:
 
     void hardreset();
 
+    void loadcustom(std::string t);
+
     //Script contents
     std::vector<std::string> commands;
     std::vector<std::string> words;