Remove Pin lock from the app

[planarvoid]

Fixes #29

• in order to fix a security issue in PasscodeLock library we have decided to remove the library completely from the app. The Pin lock feature has very low usage and presents a security issue. The project is no longer maintained.

To test:

• go to App settings
• Pin lock category is gone

[malinajirka]

Thanks Vojta!

I missed it's already assigned, sorry. I've reviewed it and tested it. LGTM.

[loremattei]

Hey! I moved the milestone to 10.9 since 10.8 has been cut. Please, feel free to move it back to 10.8 if it has to land there: just target it to the release branch and ping me to update the build!

[daniloercoli]

Looks good!