fix: override dofile to preserve Opus env (require was nil in sub-modules)

CC:Tweaked dofile loads files with _G as environment, but Opus
injects require into the program's sandbox _ENV. All dofile'd
modules (especially display.lua) could not see require.

Also add dropperController to apps.db.

etc/apps.db

@@ -20,4 +20,9 @@
     category = "Inventory",
     run = "inventoryWebBridge.lua",
   },
+  [ "im_dropper" ] = {
+    title = "Dropper Ctrl",
+    category = "Inventory",
+    run = "dropperController.lua",
+  },
 }