v2.4.0

• Feature #665: Adds CSV export format
• Feature #544: Add extra checkbox confirmation for irreversible actions
• Feature #767: Backup before destructive actions
• Feature #465: Account balances now include future transactions
• Fixed #764: Crash when importing XML files from Gnucash desktop v2.7 and up
• Fixed #768: ScheduledActionService crashes on Android 8 (Oreo)
• Fixed #731: Double display of Persian currency symbol
• Fixed #771: QIF export crashes due to illegal denominator
• Fixed #757: Backups are created every hour
• Fixed #766: Backups are kept forever