Search: introduce weighted reordering (#272)

* Database: backend for weights & timestamps

- Migration 21->22
- SearchableLaunchTimestampEntity.kt
- `weight`-column in SavedSearchableEntity
- Queries for sorting by and adjusting weight
- Queries for sorting by recent use

* move weightfactor access to favoritesRepository

* reorder calls in SearchVM

* no more datahoarding

* add settings screen for ordering

* ui fix, animations

* move ordering settings out of own screen

* remove unused localization

* weight factors

* larger factor for WeightFactor.High

* cleanup

* sort favorites by weight

* icons for favorite screen

* I hate coming up with descriptive strings

* add default weight factor to settings migration

* Add default values for search result ordering preferences

* Favorites settings: change order of preferences

* Change strings

* Replace favorites variability slider with list preference

* migration initial weight

* Change labels

* Include searchable weight column in backup

---------

Co-authored-by: MM20 <15646950+MM2-0@users.noreply.github.com>

services/backup/src/main/java/de/mm20/launcher2/backup/BackupManager.kt

@@ -182,8 +182,13 @@ class BackupManager(
     }
 
     companion object {
+        /**
+         * Format changelog:
+         * - 1.5: added `weight` to favorites
+         */
+
         private const val BackupFormatMajor = 1
-        private const val BackupFormatMinor = 4
+        private const val BackupFormatMinor = 5
         internal const val BackupFormat = "$BackupFormatMajor.$BackupFormatMinor"
     }
 }