Add parameterized callable functions from CSharp

UpsilonTests/FunctionTests.cs

@@ -166,5 +166,44 @@ end
             Assert.Equal(100, (long)result);
         }
 
+        [Fact]
+        public void ReturnFromCSharpCallWithParameter()
+        {
+            const string input = @"
+function testFunc (b)
+    if b then
+        return 100
+    else
+        return 50
+    end
+end
+";
+            var script = new Script(input);
+            Assert.Empty(script.Diagnostics.Messages);
+            var result = script.EvaluateFunction<NumberLong>("testFunc", new object[] {true});
+            Assert.Empty(script.Diagnostics.Messages);
+            Assert.Equal(100, (long)result);
+            var result2 = script.EvaluateFunction<NumberLong>("testFunc", new object[] {false});
+            Assert.Empty(script.Diagnostics.Messages);
+            Assert.Equal(50, (long)result2);
+
+        }
+
+        [Fact]
+        public void ReturnFromCSharpCallWithParameters()
+        {
+            const string input = @"
+function add (a, b)
+    return a + b
+end
+";
+            var script = new Script(input);
+            Assert.Empty(script.Diagnostics.Messages);
+            var result = script.EvaluateFunction<NumberLong>("add", new object[] {400, 128});
+            Assert.Empty(script.Diagnostics.Messages);
+            Assert.Equal(528, (long)result);
+
+        }
+
     }
 }