Dev:Updating extensions for iOS 13

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SBApplication -(FBScene*)mainScene removed
was removed in iOS 13. It can be accessed from a SBApplication by replacing  with the following:

being the name of your SBApplication instance.

SBRootIconListView
This class was removed entirely with iOS 13. Root Icon Lists are now instances of.

SBIconListFlowLayout
Layout handling in iOS 13 now uses. These are provided by an instance of.

This alone handles row/column count. It also contains a, which controls the spacing and location of icons.

SBIconListGridLayoutConfiguration
This class contains several properties that can be modified to alter the layout.

Selectors of interest include  and. These return an instance of  that can be used to manipulate layout.

Generating an apps icon image
Previously an icon image could be generated from an icon object like so

In iOS 13 this method was changed to