Tweaked the way to use getScript() like functions;

Made condition and default_expand parameters of expand_keywords optional.

git-svn-id: svn://svn.code.sf.net/p/magicseteditor/code/trunk@1080 0fc631ac-6414-0410-93d0-97cfa31319b6

src/script/scriptable.cpp

@@ -75,7 +75,7 @@ void OptionalScript::initDependencies(Context& ctx, const Dependency& dep) const
 	}
 }
 
-Script& OptionalScript::getScript() {
+Script& OptionalScript::getMutableScript() {
 	if (!script) script = new_intrusive<Script>();
 	return *script;
 }