Support all KeePass crypto algorithms

[aki8]

List algorithms actually supported by current and past versions of KeePass (non-deprecated). Consider if support also plugin-only algorithms.

[McCio]

Using AES-256 instead of AES-128 the applet is now usable. Also, AES-256 is the only algorithm supported by both KeePass 1.x and 2.x.

Supporting at least Twofish should be implemented, since it was supported by KeePass 1.x and is supported through a plugin by KeePass 2.x.

KeePass 2.x natively support ChaCha20, that should be supported by the applet, too.