Add magic.shardblade module

`import` is really just an alias for copy/paste. Ensure import order
reflects intended execution order.

main.jmc

@@ -1,3 +1,6 @@
-import "src/*";
+import "src/props.jmc";
+import "src/logger.jmc";
+import "src/commands.jmc";
+import "src/magic/*";
 
 function __tick__() {}

src/magic/shardblade.jmc

@@ -0,0 +1,5 @@
+class magic.shardblade {
+	function give() {
+		printf("&<SelectedItem>");
+	}
+}

src/props.jmc

@@ -0,0 +1,6 @@
+TextProp.nbt(
+	propertyName = "SelectedItem",
+	type = player,
+	source = "@s",
+	path = SelectedItem
+);