Enhanced printing of approval files including markdown support

Breaking Changes:

• Stop reporting the object type.
  For example,

try Approvals.verify(CGRect(x: 5, y: 10, width: 100, height: 200))

will produce these changes in your .approved. files

- CGRect: (5.0, 10.0, 100.0, 200.0)
+ (5.0, 10.0, 100.0, 200.0)

Fixes:

• Works with Xcode 13.3. Changes in Xcode 13.3's call stack caused this issue.
• Skip reporters that can't handle the file type. So if you have an image artifact, Approvals.Swift will use the first reporter that can show image differences.
• Fix iOS results watcher to support project paths with spaces.

Features:

• verifyAll improvements:
  • Now has an optional header to print above the array.
  • A new verifyAll takes a labeler closure to format each line.
    For example, here's a way to make lists without indices:

  try Approvals.verifyAll(header: "grocery list", groceries) { $0 }

• For iOS tests, ApprovalTests will print a reminder to turn on the watcher.
• SimpleLogger: an easy way to log and do performance profiling.
• UIKitApprovals.verify for verifying UIViews and rendered UIViewControllers.
• New reporters:
  • ReportMoveCommandToConsole
  • Make ReportByOpeningReceivedFile available on iOS, not just macOS

Verifiable

Approvals now offers a Verifiable interface that understands approvals.