[TECHNICAL] Upgrade min SDK to Android 6 (v23)

[JuancaG05]

Related Issues

App: #3245

Library PR (if needed): owncloud/android-library#566

• Added changelog files for the fixed issues in folder changelog/unreleased. More info here

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QA

[JuancaG05]

Changes performed:

• In owncloudComLibrary module, USE_CREDENTIALS, MANAGE_ACCOUNTS and AUTHENTICATE_ACCOUNTS permissions have been removed (they don't exist in API >= 23)
• In owncloudApp module, GET_ACCOUNTS permission has been removed (not needed in API >= 23 to access accounts, our use case. More info: https://developer.android.com/reference/android/Manifest.permission#GET_ACCOUNTS). USE_CREDENTIALS, MANAGE_ACCOUNTS and AUTHENTICATE_ACCOUNTS permissions have been removed as well.
• In owncloudData module, GET_ACCOUNTS and AUTHENTICATE_ACCOUNTS permissions have been removed.
• For notifications, the pending intents now will always have the FLAG_IMMUTABLE (for API < 23 they didn't, so this behaviour won't happen anymore).
• BiometricManager and all the related classes will always be called since from API 23 onwards, Android supports biometrics.

[jabarros]

LGTM

[jesmrec]

Changes performed:

In owncloudComLibrary module, USE_CREDENTIALS, MANAGE_ACCOUNTS and AUTHENTICATE_ACCOUNTS permissions have been removed (they don't exist in API >= 23)
In owncloudApp module, GET_ACCOUNTS permission has been removed (not needed in API >= 23 to access accounts, our use case. More info: https://developer.android.com/reference/android/Manifest.permission#GET_ACCOUNTS). USE_CREDENTIALS, MANAGE_ACCOUNTS and AUTHENTICATE_ACCOUNTS permissions have been removed as well.
In owncloudData module, GET_ACCOUNTS and AUTHENTICATE_ACCOUNTS permissions have been removed.
For notifications, the pending intents now will always have the FLAG_IMMUTABLE (for API < 23 they didn't, so this behaviour won't happen anymore).
BiometricManager and all the related classes will always be called since from API 23 onwards, Android supports biometrics.

that means, changes only affect old code that is not longer supported because minimum API jumped to 23. No new behaviour or existing behaviour changed due to changes, right?

[JuancaG05]

Changes performed:

In owncloudComLibrary module, USE_CREDENTIALS, MANAGE_ACCOUNTS and AUTHENTICATE_ACCOUNTS permissions have been removed (they don't exist in API >= 23)
In owncloudApp module, GET_ACCOUNTS permission has been removed (not needed in API >= 23 to access accounts, our use case. More info: https://developer.android.com/reference/android/Manifest.permission#GET_ACCOUNTS). USE_CREDENTIALS, MANAGE_ACCOUNTS and AUTHENTICATE_ACCOUNTS permissions have been removed as well.
In owncloudData module, GET_ACCOUNTS and AUTHENTICATE_ACCOUNTS permissions have been removed.
For notifications, the pending intents now will always have the FLAG_IMMUTABLE (for API < 23 they didn't, so this behaviour won't happen anymore).
BiometricManager and all the related classes will always be called since from API 23 onwards, Android supports biometrics.

that means, changes only affect old code that is not longer supported because minimum API jumped to 23. No new behaviour or existing behaviour changed due to changes, right?

Yes, we could say it like that. No new behaviour, and existing behaviour was adapted to only API >= 23, but no functional changes.

[jesmrec]

So, testing will be moved to regression stage. Just checking that everything that works is still working.

Nothing to do from my side