Add android-6-runtime-permission-check-mechanism support

[k3b]

Implement the new android-6-runtime-permission-check-mechanism as described https://developer.android.com/training/permissions/requesting.html and
https://material.google.com/patterns/permissions.html

Open Questions:

Is it possible in Android-6+ to ask for a permission (or permissoingroup) at runtime that is not declared in the manifest? If yes adding a uri at runtime should also allow to add permissions to be stored, too

Help wanted

At the moment "k3b" (the owner of this repository) has no android-6 device and therefore will not implement this ticket. Megerequests are welcome.

[ahsim]

still wait android 6+ support

[1ZIP]

Add plx

[k3b]

May be helpfull to implement this feature: https://github.com/afollestad/assent

[AlbertoP64]

I, I have an Android 6.0.1 device actually (yes, in 2025!), not rooted, but I'm not fond in developing on Android, so if you need to debug a test build I could eventually run it and send the data collected, or perform required test actions.

[AlbertoP64]

I add info that in 2025 trying to install the App from F-Droid, apart for usual authorizations, leads to a Google Play Protect screen as shown in the images, then after clicking 'more details' you can install it anyway.
See attached images.

Text in images (in Italian) translates to:

`Google Play Protect

Insecure App blocked

This App has been developed for a previous version of Android and don't include more recent privacy protections.

More details... -> opens to:

If you install this App you could put the device at risk. More info on Play Protect (link to standard help page).

Install anyway -> let me to install the App anyway.`

This could be possibly linked to the missing support described in this issue, so I added the info here instead of opening a new issue. Hope correct.