* Fix false positives in valid_ibinspectable rule when using Swift 5.2
when defining inspectable properties in class extensions with computed
properties.
The following was triggering:
```swift
extension Foo {
@IBInspectable var color: UIColor {
set {
self.bar.textColor = newValue
}
get {
return self.bar.textColor
}
}
}
```
Fix by checking to see if an instance property has `set` keywords in its
body when running with Swift 5.2 or later.
* fixup! Fix false positives in valid_ibinspectable rule when using Swift 5.2
* Add Example wrapper in order to display test failures inline when running in Xcode.
* Stop using Swift 5.1-only features so we can compile on Xcode 10.2.
* Wrap strings in Example.
* Add Changelog entry.
* Wrap all examples in Example struct.
* Better and more complete capturing of line numbers.
* Fix broken test.
* Better test traceability.
* Address or disable linting warnings.
* Add documentation comments.
* Disable linter for a few cases.
* Limit mutability and add copy-and-mutate utility functions.
* Limit scope of mutability.
Marcelo Fabri
JP Simard
Zev Eisenberg
Paul Taykalo