[crosscode] re-export game execution context in btw-i-use-arch-mod

crosscode/btw-i-use-arch-mod/package.json

@@ -2,5 +2,6 @@
   "name": "btw I use Arch",
   "version": "0.0.0",
   "description": "A mod for masochists like myself",
-  "prestart": "prestart.js"
+  "prestart": "prestart.js",
+  "preload": "preload.js"
 }

crosscode/btw-i-use-arch-mod/preload.js

@@ -0,0 +1,6 @@
+// I know that this is legacy feature provided by CCLoader way back when mods
+// weren't executed inside the game iframe's context, but it is useful
+// nevertheless because console in Chrome's devtools automatically selects
+// window.top as the execution context by default, so writing `cc.` is faster
+// than `modloader.frame.contentWindow`
+window.top.cc = window;