Add methods for scheduling `AcediaConfig` saving

sources/Config/AcediaConfig.uc

@@ -67,6 +67,9 @@ class AcediaConfig extends AcediaObject
 //  was detected in config, but not yet loaded.
 //      Only its default value is ever used.
 var private HashTable existingConfigs;
+//  TODO: comment and add static cleanup
+var private array<AcediaConfig> clearQueue;
+var private bool                syncScheduled;
 
 //  Stores name of the config where settings are to be stored.
 //  Must correspond to value in `config(...)` modifier in class definition.
@@ -174,7 +177,7 @@ public final static function bool NewConfig(BaseText name)
         new(none, NameToStorageVersion(name.ToString())) default.class;
     newConfig._ = __();
     newConfig.DefaultIt();
-    newConfig.SaveConfig();
+    newConfig.SyncSave();
     default.existingConfigs.SetItem(name, newConfig);
     name.FreeSelf();
     return true;
@@ -212,14 +215,18 @@ public final static function bool Exists(BaseText name)
 */
 public final static function DeleteConfig(BaseText name)
 {
-    local AcediaObject value;
+    local AcediaConfig value;
+
     if (name == none)                       return;
     if (default.existingConfigs == none)    return;
 
     name = name.LowerCopy();
-    value = default.existingConfigs.TakeItem(name);
-    if (value != none) {
-        value.ClearConfig();
+    value = AcediaConfig(default.existingConfigs.TakeItem(name));
+    if (value != none)
+    {
+        __().scheduler.RequestDiskAccess(default.existingConfigs).connect =
+            HandleClearQueue;
+        default.clearQueue[default.clearQueue.length] = value;
     }
     __().memory.Free(name);
 }
@@ -317,8 +324,38 @@ public final static function SaveData(BaseText name, HashTable data)
     if (requiredConfig != none)
     {
         requiredConfig.FromData(data);
-        requiredConfig.SaveConfig();
+        requiredConfig.SyncSave();
+    }
+}
+
+/**
+ *  Synchronizes current in-memory data by saving it onto the disk (into
+ *  the config file). Can be performed asynchronously (actual saving can be
+ *  postponed for performance reasons).
+ */
+public final function SyncSave()
+{
+    if (syncScheduled) {
+        return;
+    }
+    syncScheduled = true;
+    __().scheduler.RequestDiskAccess(default.existingConfigs).connect = DoSync;
+}
+
+//  Does actual saving
+private final function DoSync()
+{
+    syncScheduled = false;
+    SaveConfig();
+}
+
+private final static function HandleClearQueue()
+{
+    if (default.clearQueue.length <= 0) {
+        return;
     }
+    default.clearQueue[0].ClearConfig();
+    default.clearQueue.Remove(0, 1);
 }
 
 defaultproperties