Add "Apply" preference to set Hover customizations without a reboot

Customization values need a SystemUI restart to be applied into Hover.
This preference allows a restart of SystemUI eliminating the need of a
device reboot.

SuperUser permission required.

- Also reodered code to make it alphabetical

Signed-off-by: Shubhang Rathore <shubhang92@gmail.com>
Strings: "Reset all" -> "Reset" preference title
Add "Test notification" feature

After 3 seconds, a test notification is posted to the status bar.

Time delay has been given so that the user may exit from xHover
back to home screen or any other app to be able to send the
notification to Hover. If the user stays in xHover while the test
notification is being posted, the notification doesn't show up in
Hover. That is by design, as made by Paranoid Android developers.

Signed-off-by: Shubhang Rathore <shubhang92@gmail.com>
Add icons to Apply, Test notification and Reset
Update xHover Xposed module description
Bump to version 1.1