feat(core): refactor module, fix 28 memory leaks, expose iOS 11 activity types, lint sources

[hansemannn]

Sooo this pull request escalated a bit. Started with the idea of compiling a dist-version of this module, I did a few things:

• Use 7.4.1.GA to build
• Fix memory leaks (total of 28, from unused vars to actual allocation problems)
• Expose two missing constants (ACTIVITY_OPEN_IN_IBOOKS and ACTIVITY_MARKUP_AS_PDF)
• Make all constants strings (they have been numbers, not sure why, but the native ones are strings as well)
• Bump version to 2.0.0 (required by some Utils that are 6.3.0+) - it should be time

Also some small tweaks like removing unused (generated) meta files like old python scripts and empty directories.

It works fine on my end, but I would love to hear some feedback if these changes are generally welcome. Thanks!

dk.napp.social-iphone-2.0.0.zip