Implement rex_selectedSegmentIndex for UISegmentedControl

[iv-mexx]

Title says it all

[iv-mexx]

Hm, the first CI fails were because I've added UISegmentedControl to all targets instead of only to the iOS target. I've already fixed that.

But now, it seems to still fail for the tvOS target:

-> Rex (0.10.0)
- ERROR | [tvOS] xcodebuild: Returned an unsuccessful exit code. You can use --verbose for more information.
- ERROR | [tvOS] xcodebuild: /Users/travis/build/neilpa/Rex/Source/UIKit/UISegmentedControl.swift:16:21: error: use of unresolved identifier 'rex_controlEvents'>

even though the UISegmentedControl.swift is not added to the tvOS target anymore 😕

[iv-mexx]

Oh nevermind, i guess UISegmentedControl.swift needs to be explicitly excluded for the tvOS target in the Podspec.

[neilpa]

Oh nevermind, i guess UISegmentedControl.swift needs to be explicitly excluded for the tvOS target in the Podspec.

I've hit this problem a couple times too. One of the reasons I'm not a fan of pods since you have multiple project definitions.

[neilpa]

@iv-mexx I invited you as a collaborator to the repo. Feel free to review and merge PRs since I'm not as on top of them these days.

[iv-mexx]

@neilpa Cool, thanks 😃 🎉