LibJS: Add NativeFunction, a callable wrapper around a C++ lambda

This can be used to implement arbitrary functionality, callable from
JavaScript.

To make this work, I had to change the way CallExpression passes
arguments to the callee. Instead of a HashMap<String, Value>, we now
pass an ordered list of Argument { String name; Value value; }.

This patch includes a native "print(argument)" function. :^)

1 files changed, 1 insertions, 0 deletions

diff --git a/Base/home/anon/js/native-function.js b/Base/home/anon/js/native-function.js
new file mode 100644
index 0000000000..932eb9cf56
--- /dev/null
+++ b/Base/home/anon/js/native-function.js
@@ -0,0 +1 @@
+print("Hello friends!")