Breathly - Just Breathe

Hello hello! A bunch of smaller updates in this release:
- You can increment/decrement custom breathing pattern steps by 0.5 seconds now.
- Custom breathing pattern steps can be set up to 99 seconds.
- The exercise timer can be set up to 60 minutes.
- You can long-press on the plus and minus buttons to increase/decrease the timing faster.
- I increased the vibration strength to ensure it works on all devices.