privacy: Actually set the blacklist preference

The preference was not being set, which caused this code to throw an NPE on
devices without telephony when opening the privacy preferences.

This bug also affects devices with telephony in that the preference doesn't
update its text. I also got rid of the null check because the preference
always exists, the null check is pointless and ended up hiding this bug.

Change-Id: I95555d44349700a8f29a71a2f2ee9aedf419b49b

Settings: Fix blacklist settings crash

Change-Id: Idd261aa9f8e2867312aaaece26150671b177994c

Settings: materialize Blacklist settings

* Add a FAB
* Add a (generic system) enable/disable switch bar

Change-Id: I0984bf6769abef48cc7e0a643c2bdd73219954fc
Signed-off-by: Roman Birg <roman@cyngn.com>

Settings: add a way to open blacklist settings externally

Opening the activity doesn't theme the switch bar - an alias works.

Change-Id: I78efb382f4f1f4d208f122fedb0d71a86b515405
Signed-off-by: Roman Birg <roman@cyngn.com>

blacklist: make it possible to unblacklist phone/messages via checkboxes

Change-Id: I7d982d17818efe065e4e22f2a86a46493672584a

Settings: fix blacklist settings crash

On a device rotate, the MultiSelectListPreference would try and restore
its state since the preferences aren't persisted. Clear the persisted
flag so the MultiSelectPreference doesn't try and restore the states, as
they get populated in onResume().

Change-Id: I0d0304e2367ade66e35ae7df432575d13ed0993e
Signed-off-by: Roman Birg <roman@cyngn.com>

Settings : Update blacklist strings

Change-Id: I08ea4405f41f86a9eaf7bae74cbb61fa1fb0c8aa
(cherry picked from commit 6d8cc2c6)

Settings : Add input checks for blacklist input

There can be situations where user enters invalid input.
Ensure that is handled.

Repro :

1. Add new blacklist entry
2. Enter /
3. Press ok
4. Enjoy crash

issue-id: CYNGNOS-980

Change-Id: Ica90ac835f374569123e679ba39c3caa7179ef65

Settings : Fix blacklist delete number crash

issue-id : HAM-795

Change-Id: I25306b3d4bead5487f039c3f51b631b1ef88b18d