Cryptography Tool [AES256/CBC/

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- targetSdkVersion 30
- Libraries update
- Added AES-256 GCM Mode, choose from drop down
- Increased random entropy
- Gradle 4.0.1

Previously:
- Migrate to AndroidX
- Recompile for Android Pie API 28 Revision 6
- Optimization to reduce code size
- 64-bit validation checks
- Fix rotation bugs. Thanks to せいなまえ, ありがとうございました
- Reduce redundant code
- Fix Icons for Android 7+
- Reduce redundant code
- Lower API level to 17, support Android 4.4
- No dependency on touch screen
- Speed improvement