Update for iOS 13 and Dark Mode

[inPhilly]

• I have read this issue template and provided all possible information.
• I'm using CocoaPods and have run pod update before filing this issue.

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Hardware / Software

Which version of the library were you using? latest
Which version of iOS are you running? iOS 13.4.1
What model of iOS device were you testing on? simulator
If using CocoaPods, which version of CocoaPods are you on? n/a

Goals

A passcode protector that functions well and fits the latest iOS style

Expected Results

In iOS 13 Dark Mode, the Settings controller would be dark

Actual Results

In iOS 13 Dark Mode, the Settings controller is light

Steps to Reproduce

Run in Dark Mode in an iOS 13 app and access the Settings controller. Observe that it is light.

[TimOliver]

Great idea! It'd probably be a really easy matter of adding 'Automatic' choices to TOPasscodeViewStyle and then attaching the theme colouring to the iOS 13 APIs.

I plan to give this library some much needed TLC as soon as I can. I'll be sure to add this in then. :)