add shape picker for backgrounds

Shared/Models/UserDefaultsStore.swift

@@ -23,6 +23,7 @@ class UserDefaultsStore {
         case customMoodTintUpdateNumber
         case textColor
         case showNSFW
+        case shape
         
         case contentViewCurrentSelectedHeaderViewBackDays
         case contentViewHeaderTag
@@ -190,6 +191,15 @@ class UserDefaultsStore {
         return SavedMoodTint()
     }
     
+    static func getCustomBGShape() -> BGShape {
+        if let data = GroupUserDefaults.groupDefaults.object(forKey: UserDefaultsStore.Keys.shape.rawValue) as? Int,
+           let model = BGShape.init(rawValue: data) {
+            return model
+        } else {
+            return BGShape.circle
+        }
+    }
+    
     @discardableResult
     static func saveCustomMoodTint(customTint: SavedMoodTint) -> SavedMoodTint {
         do {