[Feature Request]: remove old-fashion keyboard when input amount.

[evan0greenup]

Steps to reproduce the behaviour

Feature request

Expected behaviour

use Android Keyboard instead of Old-fashion keyboard for currency amount input.

Actual behaviour

When attempt to input currency amount, it will switch to old-fashion keyboard.

suggestion to handle potential risk

in order to prevent illegal input (like 8sdfs1234, 123.213123.123), it can remove illegal character and turn to most similar legal form according to a specific rule.

Software specifications

• GnuCash Android version: 2.4.0
• System Android version: 8.0
• Device type: Phone