Add transparency to the widget

[aleksfadini]

Feature description

Most widgets nowadays can be themed with transparency, termux widget can't.

Here is a comparison with a calendar widget and termux

https://www.reddit.com/r/termux/comments/v8q2y7/termux_widget_transparency_is_it_possible/?utm_medium=android_app&utm_source=share

This feature is purely esthetic, not that important, but it should be very straightforward to implement according to new android standards for widget themes.

I love termux. Transparency would make the widget more enjoyable, as it currently is one of the few widgets I have that do not allow this specific way of theming them.

[aleksfadini]

Upon investigating further, this request would be fulfilled by the bigger feature ask here #10