Add key borders

[ghost]

Add settings for enable key borders to make it easier to see where one key ends and the other begins

[RokeJulianLockhart]

Weirdly, enter and space possess borders already, whereas no alternative key does. If this suggestion is supported, please remove the key-borders for all keys when they are disabled.

[nandlab]

I would also appreciate if the keys had borders.

[naveensingh]

Hi! If anyone is willing to test, I have uploaded a test APK with a setting to enable key borders: https://github.com/Naveen3Singh/Simple-Keyboard/releases/download/test_key_borders/keyboard-prepaid-debug.apk Any feedback is appreciated. thanks!