Bug fixes and stability improvements

Fixed a bug: Now you can edit your mix titles again! :)

Importing music now works in iOS 13!

Just a few fixes and updates, including:
- Share via Email now works in iOS 10
- Updated the Dropbox API for better Dropboxiness
- Updated the Help and enabled notifications to show when I've replied to your Help request!

MixPlay still can't import from an Apple Music Subscription due to an Apple bug, which they've acknowledged but not fixed, so please don't 1-star me for it! :)
Thanks,
Corey

Fixed an error when importing section definitions (in the .plist file) after someone Shares a mix with you. And the version 1.5 update added a lot, such as:
- import from iTunes (after you make the song "Available on this device" - but it cannot import from an Apple Music subscription due to Apple's DRM))
- Import from Dropbox
- Import wav, .m4a, and .aac files (in addition to mp3)
- Tempo adjusts from 50-150%
- Translated into 10 languages
- Phone doesn't lock or sleep while using MixPlay.
- No more ads!

Enjoy, and please leave a review if you like it! If you don't, let me know why at corey@mixplayapp.com
Thanks!
-Corey

Hi all! Here's what's new in 1.5:
- Import songs from your iTunes library **if** you first tap the song's "..." button in iTunes and choose "Make song available Offline" (due to Apple DRM)
- Import MP3, WAV, M4A, or AAC files.
- Import from Dropbox.
- Fixed the "Share" function so both the music file and section definitions are emailed.
- Translated to 10 languages, which was not fun, believe you me.
- Prevented Lock or Sleep when playing.
- Tempo adjusts from 50% to 150%.
- Device volume changes the MixPlay volume.
- Fixed a bug where symbols in imported filenames messed things up.
- Last but not least, no more ads!

I hope these updates help you out! Thanks!
-Corey

- Fixed a bug that happened when more than 7 sections were added.
- Made the Import from Mail instructions a little clearer.
- Created an email list at mixplayapp.com to keep coaches, mixers, and choreographers informed on MixPlay and some other things I'm working on to help them.

Let me know if you have any ideas!
Thanks,
Corey