Fixes #3 Add (optional) support for ARC

After creating a new SkankySDK project, use the **Refactor > Convert to Objective-C ARC…** command to convert your project to ARC.

`KISetPatchInputValue` uses `object_setInstanceVariable`, which isn't allowed in ARC.
I don't know how to rewrite `KISetPatchInputValue` with ARC support so I removed it.