Context::script_singleton constructor for running a single script from cli

src/context.rs

@@ -19,6 +19,14 @@ impl Context{
 	pub const fn new(dom:WeakDom)->Context{
 		Context{dom}
 	}
+	pub fn script_singleton(source:String)->(Context,crate::runner::instance::Script){
+		let dom=WeakDom::new(
+			rbx_dom_weak::InstanceBuilder::new("Script")
+			.with_property("Source",rbx_types::Variant::String(source))
+		);
+		let script=crate::runner::instance::Script::new(dom.root_ref());
+		(Context{dom},script)
+	}
 	pub fn from_mut(dom:&mut WeakDom)->&mut Context{
 		unsafe{&mut *(dom as *mut WeakDom as *mut Context)}
 	}