Refactor the way holder caches are invalidated in order to improve consistency (#734)

bukkit/src/main/java/me/lucko/luckperms/bukkit/BukkitConfigAdapter.java

@@ -55,11 +55,6 @@ public class BukkitConfigAdapter extends AbstractConfigurationAdapter implements
         this.configuration = YamlConfiguration.loadConfiguration(this.file);
     }
 
-    @Override
-    public boolean contains(String path) {
-        return this.configuration.contains(path);
-    }
-
     @Override
     public String getString(String path, String def) {
         return this.configuration.getString(path, def);

bukkit/src/main/java/me/lucko/luckperms/bukkit/vault/VaultPermissionHook.java

@@ -403,7 +403,7 @@ public class VaultPermissionHook extends AbstractVaultPermission {
     void holderSave(PermissionHolder holder) {
         if (holder.getType().isUser()) {
             User u = (User) holder;
-            this.plugin.getStorage().saveUser(u).thenRunAsync(() -> u.getRefreshBuffer().request(), this.plugin.getBootstrap().getScheduler().async());
+            this.plugin.getStorage().saveUser(u).thenRunAsync(() -> u.reloadCachedData(), this.plugin.getBootstrap().getScheduler().async());
         }
         if (holder.getType().isGroup()) {
             Group g = (Group) holder;