Leif/small improvements (#73)

* Revert "Remove State wrapping of stored and sync values (#70)"

This reverts commit 2f8d00f.

* Remove synchronize calls

The only recommended time to call this method is
upon app launch, or upon returning to the
foreground, to ensure that the in-memory key-value
store representation is up-to-date.

* Move files to new folders

Sources/AppState/Application/Types/Application+Scope.swift → Sources/AppState/Application/Types/Helper/Application+Scope.swift

@@ -4,15 +4,15 @@ extension Application {
 
      For example, it could be used to scope a state to a particular screen or user interaction flow.
     */
-    struct Scope {
+    public struct Scope {
         /// The name of the scope context
-        let name: String
+        public let name: String
 
         /// The specific id for this scope context
-        let id: String
+        public let id: String
 
         /// Key computed property which builds a unique key for a given scope by combining `name` and `id` separated by "/"
-        var key: String {
+        public var key: String {
             "\(name)/\(id)"
         }
     }

Sources/AppState/Application/Types/Application+StoredState.swift → Sources/AppState/Application/Types/State/Application+StoredState.swift

@@ -18,11 +18,11 @@ extension Application {
             get {
                 let cachedValue = shared.cache.get(
                     scope.key,
-                    as: Value.self
+                    as: State<Value>.self
                 )
 
                 if let cachedValue = cachedValue {
-                    return cachedValue
+                    return cachedValue.value
                 }
 
                 guard
@@ -41,7 +41,11 @@ extension Application {
                     userDefaults.removeObject(forKey: scope.key)
                 } else {
                     shared.cache.set(
-                        value: newValue,
+                        value: Application.State(
+                            type: .stored,
+                            initial: newValue,
+                            scope: scope
+                        ),
                         forKey: scope.key
                     )
                     userDefaults.set(newValue, forKey: scope.key)

Sources/AppState/Application/Types/Application+SyncState.swift → Sources/AppState/Application/Types/State/Application+SyncState.swift

@@ -54,11 +54,11 @@ extension Application {
                 guard
                     let cachedValue = shared.cache.get(
                         scope.key,
-                        as: Value.self
+                        as: State<Value>.self
                     )
                 else { return initial() }
 
-                return cachedValue
+                return cachedValue.value
             }
             set {
                 let mirror = Mirror(reflecting: newValue)
@@ -67,17 +67,19 @@ extension Application {
                    mirror.children.isEmpty {
                     shared.cache.remove(scope.key)
                     icloudStore.removeObject(forKey: scope.key)
-                    icloudStore.synchronize()
                 } else {
                     shared.cache.set(
-                        value: newValue,
+                        value: Application.State(
+                            type: .sync,
+                            initial: newValue,
+                            scope: scope
+                        ),
                         forKey: scope.key
                     )
 
                     do {
                         let data = try JSONEncoder().encode(newValue)
                         icloudStore.set(data, forKey: scope.key)
-                        icloudStore.synchronize()
                     } catch {
                         Application.log(
                             error: error,