Allow non-local script functions to be called from outside the script

src/Script.cpp

@@ -1,3 +1,5 @@
+#include <utility>
+
 #include <utility>
 #include <unordered_map>
 #include "Script.hpp"
@@ -65,6 +67,16 @@ EvalValue *Script::GetLastValue() {
     return _evaluator->GetLastValue();
 }
 
+bool Script::HasFunction(const string &key) {
+    auto f = _scriptVariables->find(HashedString(key).GetHash());
+    return f != _scriptVariables->end() && f.operator->()->second->GetType()->GetClass() == TypeClass ::Function;
+}
+
+EvalValue *Script::CallFunction(const string &key, vector<EvalValue *> variables) {
+    auto var = (ScriptFunctionEvalValue*)GetVariable(key);
+    return this->_evaluator->EvaluateFunction(var, std::move(variables));
+}
+
 extern "C" {
     Script* CreateScript(char * s){
         return Script::Create(s);