Implement support for "On Error Resume" for our April 1st release.

This adds support for Visual Basic-style error recovery.

Issue: PLCR-534
Add a new subproject that we'll use to demo the "On Error Resume Next" behavior.

Issue: PLCR-534
Wire up a basic NULL dereference demo.

Issue: PLCR-534
Rather than stepping IP, this implementation works by unwinding the crashing frame, trying to return 0x0 to the caller.

For obvious reasons, this works more reliably when unwind info is
available and we can restore non-volatile registers.

Issue: PLCR-534
Bump up the total crash count that triggers "crash loop" detection to something not easily hit in manual testing.

Issue: PLCR-534
Set minimum iOS version to 7.0.

Issue: PLCR-534
Update to latest framework version.

Issue: PLCR-534
CFRelease(NULL) is a much more amusing test.

Issue: PLCR-534
Give iOS example an iOS-specific name.

Issue: PLCR-534
Stub out a Mac example project.

Issue: PLCR-534
Implement Mac demo

Issue: PLCR-534
Add a recovery GUI to the Mac OS X framework.

Issue: PLCR-534
Fix iOS build, tweak the Mac OS X messaging.

Issue: PLCR-534
Add missing iOS messaging.

Issue: PLCR-534
Update the iOS embedded framework.

Issue: PLCR-534
Fix spelling mistake, minor UI cleanup.

Issue: PLCR-534
Add an animation that pauses while processing the crash.

Issue: PLCR-534
Enable Developer ID code signing of the Mac app.

Issue: PLCR-534
Set the April Crash Recovery Preview version number.

Issue: PLCR-534
Fix linking when building for the iOS simulator.

Issue: PLCR-534