Motivation: We can't publish to the Play Store with a targetSdkVersion < 31
The new targetSdk required two changes:
* Specifying when activities, services and receivers should be exported or
not to other apps. For the ones I wasn't sure of what we want, I made
them exported to not break something.
* Specifying when a PendingIntent should be mutable or immutable. I made
them all mutable for now.
Summary: A simple widget to execute commands from android desktop
Test Plan:
Add the widget and execute commands from it.
By default, the selected device is the first device in the device list.
The selected device can be changed via the widget title.
If there is no commands, the widget show an empty list
If there is no connected device, show the message located in @string/unreachable_description
Reviewers: albertvaka, nicolasfella, #kde_connect
Reviewed By: albertvaka
Subscribers: kdeconnect, nicolasfella
Tags: #kde_connect
Differential Revision: https://phabricator.kde.org/D12507
