This change should have no user impact.
This makes a few changes to `OWSActionSheets`:
- `OWSActionSheets` is now an enum (with an Objective-C bridge)
- Some unnecessary methods were removed
- Fixed some long lines
It also removes the payment-specific
`OWSActionSheets.showPaymentsOutdatedClientSheetIfNeeded` extension. It
didn't add much and required passing a global object, so I removed it.
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