Two changes for Android/Fire TV users

[TDGalea]

Feature description

First of all, thank you for all the work that goes into Termux. I can't overstate how valuable this app is!
Second of all, I hope you don't mind me putting both these requests in one - I didn't want to spam!

Anyway, my requests to improve Android / Fire TV usability are as follows:

1: Set cursor to "pointer" for Fire TV devices

Fire TV's default cursor is a hollow circle. It's okay, but when you decrease text size, it's easy to mis-click in, say, Midnight Commander.

I read that adding this to the tag in AndroidManifest.xml should do the trick:

<meta-data android:name="com.amazon.input.cursor" android:value="pointer"/>

I did try this myself, but the signatures thing prevents installation (perhaps because I left the plugins installed), and that goes beyond my brain capacity for now.

2: Allow completely disabling the bottom OSK bar

When using an external keyboard, the bottom extra-keys bar pointlessly eats up space. I've read this can be disabled, but haven't had luck finding a way to do so. I believe this would be a valuable option either within the main app settings, or perhaps an option settable within ~/.termux/termux.properties.

Additional information

In JuiceSSH, tapping the terminal while the software keyboard is on-screen will toggle the extra keys bar. While this is perfectly functional, I'm not a huge fan of it being that easy to toggle, as it can be done accidentally.