Only add/or remove preferences when absolutely needed.
Also fix a 'load data from backend' method that wasn't.
Fixes: 216747934
Test: ZenModeAutomaticRulesPreferenceControllerTest
Test: view schedules page
Test: add schedule
Test: remove schedule
Test: view schedule child page and return to schedules page
Change-Id: I237c2ca7ea89ee6e42354470a76712068a7f4dd7
The approach of reloading all rules (and recreating all ZenRulePreferences) every time the rule set changed causes the switches on the page to stop working.
This change keeps the ZenRulePreference around as long as the rule itself is around and keeps it updated, while re-adding the preferences to the PreferenceCategory if needed due to rules changing.
Fixes: 229879326
Test: manual, ZenModeAutomaticRulesPreferenceControllerTest
Change-Id: I4eba41e8252cedd87ac866e4b97513970ca2d94a
The notification package was getting too big.
Test: make -j64 RunSettingsRoboTests
Fixes: 145224451
Change-Id: I25ba82f42f7a137d8adcce72dcf8089d0e018bdc
