Removed MGLMapView's IBDesignable attribute. The map's view render attributes
uses GL, making changes through the inspectables were not reflected in the storyboard
and were causing IB crashes.
* [ios] Deactivate MGLMapView IBDesignable.
* [ios] Remove IBDesignable agent code.
* [ios, macos] Remove NSProcessInfo category from iOS.
Added the ios/macos format expression bindings.
The equivalent is mgl_attributed: or mgl_attributed({}) when making an expression using the expressionForFormat selector.
A new constructor called mgl_expressionForAttributedExpressions:(NSArray<NSExpression*>*)attributedExpressions was added to NSExpression+MGLAdditions category.
Updated the symbol style layer text test to use the bindings.
Updated the Predicates and Expressions.md and For Style Authors.md.ejs template with the bindings.
The `MGLNetworkConfiguration` class was make public, and added `sessionConfiguration` property to let developers customize the `NSURLSessionConfiguration` object that is used to make HTTP requests in the SDK.
