Fix PolygonOverlay constructor

[Solidsilver]

Currently the type definition for the PolygonOverlay constructor takes a single array of points. However, according to documentation it can also take a 2-D array of points. To my knowledge this means the constructor should take a 2-D array, and those needing to use a 1-D array need to wrap it. This also may be the case for other overlay constructors.

To Investigate:

• Do other overlay types have the same issue?
• Does typescript support auto-wrapping single arrays into double arrays (as described in Apple's API)

To Do:

• Fix the appropriate constructors so 2-D arrays are supported.

Note: All overlay constructors can be found in the Overlays type definition file

[Solidsilver]

Note: I did a quick and dirty fix for the PolygonOverlay constructor so my project will work, but this should still be reviewed and fixed in all constructors that need it.