This commit adds a new export annotation: @exportFunction. @exportFunction is to be used to declare functions that take an options object literal as their first arguments. @exportFunction is to regular functions as @exportClass is to constructors.
The usage of @exportFunction is as follows:
@exportFunction ol.control.defaults ol.control.DefaultsOptions ol.Collection
Note: the Function#export method uses a recursive function. This is to handle nested options.