New HP41 Emulator for OS X

[iPera]

@Anetzer, thank you

I fixed problem with USER-indicator stays lit, when the emulator is turned off via its ON-key. New build is on the server. Also, I fixed (I hope so) some crash problems.

Skins are planned for v1.1

My current plan is to publish application on Mac App Store in the next 10 days. Next year I plan to publish iOS application. Both OS X and iOS will be free and open source.