[#10] Converted DecorationView < UIView

The conversion compiles without error but needs to be tested against
VCs that make use of it.

Will next convert PendulumBehavior as one test of DecorationView
[#10] Converted DecorationView - needs testing
[#10] removed unwanted empty dir uikit-dynamics-catalog.
[#11] AttachmentView converted.
Completed attachmenst_view_controller

- added tests

- added Attachments + Collision to ExampleTableController

- cleaned up DecorationView

- commented out DecorationView self.arrow_view.center since it is not
used by attachment_view - this call may need to be made conditional
based on use by other VC’s
update decoration_view to be compliant with attachment_view version.
Merge branch 'attachments_view'