Fantasy Soundboard - Tabletop RPG Sound Effects

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- Updated quite a few of the old alert dialog menus to the new appearance.
- Changed the icon for the stop button on the mixer.
- Changed the stop button in the mixer so it removes the sound from the mixer right away.
- Removed the gradient from buttons to improve performance on older devices.
- Integrated Google Firebase.
- Fixed a crash bug when creating a favorites list with an invalid name, renaming a list to the same as another, or creating a list with a name that already exists.