Remove FLEX_AT_LEAST_IOS13_SDK and usages. It was causing several issues being in a header that needed to be private but also included in public headers.
Consolidate the logic between FLEXShortcut and FLEXMetadataSection for how metadata rows are displayed.
There was a lot of duplication between these two classes before this. Now there is one source of truth: the object itself will tell you how to display itself via our categories in FLEXRuntime+UIKitHelpers.
These classes will be the direct data sources for explorer view controllers, and runtime metadata sections will pull their data from a `FLEXObjectExplorer` instance tied to an object explorer view controller