KML - Support for rectangles that are bigger than the globe

Discussed here: #4343

In this KMZ file, the rectangle goes from (216, 108) to (-216, -108) to make the image wrap around the globe since the PNG has transparent padding


Google Earth and World Wind support this case, so we might want to consider adding support as well

[Scenario A2 - global temperatures.kmz.txt](https://github.com/AnalyticalGraphicsInc/cesium/files/540203/Scenario.A2.-.global.temperatures.kmz.txt)

Start with discussion #4343 and inspect the provided Scenario.A2.-.global.temperatures.kmz.txt example, focusing on the rectangle coordinates from (216, 108) to (-216, -108). Determine how Cesium currently handles KML rectangles and verify that the example image wraps around the globe as expected.

Written by the indexing model from the issue text.