Implement ImageSprite origin for iOS

[ewpatton]

Change-Id: I03b0bf3555728860c9b477ca79c3f9989b591449

General items:

• [ ] I have updated the relevant documentation files under docs/
• [ ] My code follows the:
  • [ ] Google Java style guide (for .java files)
  • [ ] Google JavaScript style guide (for .js files)
• [x] ant tests passes on my machine

If your code changes how something works on the device (i.e., it affects the companion):

• [x] I branched from ucr
• [x] My pull request has ucr as the base

Further, if you've changed the blocks language or another user-facing designer/blocks API (added a SimpleProperty, etc.):

• [ ] I have updated the corresponding version number in YaVersion.java
• [ ] I have updated the corresponding upgrader in YoungAndroidFormUpgrader.java (components only)
• [ ] I have updated the corresponding entries in versioning.js

For all other changes:

• [ ] I branched from master
• [ ] My pull request has master as the base

What does this PR accomplish?

This PR implements the iOS logic for MarkOrigin, OriginX, and OriginY properties along with Simplex collision detection added by #2496.