Implement ApplicationId in Guild model

src/Discord.Net.Core/Entities/Guilds/IGuild.cs

@@ -20,7 +20,7 @@ namespace Discord
         /// <summary> Gets the level of requirements a user must fulfill before being allowed to post messages in this guild. </summary>
         VerificationLevel VerificationLevel { get; }
         /// <summary> Gets the level of content filtering applied to user's content in a Guild. </summary>
-        ExplicitContentFilterLevel ExplicitContentFilterLevel { get; }
+        ExplicitContentFilterLevel ExplicitContentFilter { get; }
         /// <summary> Returns the id of this guild's icon, or null if one is not set. </summary>
         string IconId { get; }
         /// <summary> Returns the url to this guild's icon, or null if one is not set. </summary>
@@ -40,6 +40,8 @@ namespace Discord
         ulong? EmbedChannelId { get; }
         /// <summary> Gets the id of the channel where randomized welcome messages are sent, or null if not. </summary>
         ulong? SystemChannelId { get; }
+        /// <summary> Gets the application id of the guild creator if it is bot-created. </summary>
+        ulong? ApplicationId { get; }
         /// <summary> Gets the id of the user that created this guild. </summary>
         ulong OwnerId { get; }
         /// <summary> Gets the id of the region hosting this guild's voice channels. </summary>

src/Discord.Net.Rest/API/Common/Guild.cs

@@ -41,6 +41,8 @@ namespace Discord.API
         public string[] Features { get; set; }
         [JsonProperty("mfa_level")]
         public MfaLevel MfaLevel { get; set; }
+        [JsonProperty("application_id")]
+        public ulong? ApplicationId { get; set; }
         [JsonProperty("system_channel_id")]
         public ulong? SystemChannelId { get; set; }
     }

src/Discord.Net.Rest/Entities/Guilds/RestGuild.cs

@@ -33,6 +33,7 @@ namespace Discord.Rest
         public string IconId { get; private set; }
         public string SplashId { get; private set; }
         internal bool Available { get; private set; }
+        public ulong? ApplicationId { get; private set; }
 
         public DateTimeOffset CreatedAt => SnowflakeUtils.FromSnowflake(Id);
 
@@ -71,7 +72,8 @@ namespace Discord.Rest
             VerificationLevel = model.VerificationLevel;
             MfaLevel = model.MfaLevel;
             DefaultMessageNotifications = model.DefaultMessageNotifications;
-            ExplicitContentFilter = model.ExplicitContentFilter;            
+            ExplicitContentFilter = model.ExplicitContentFilter;
+            ApplicationId = model.ApplicationId;
 
             if (model.Emojis != null)
             {

src/Discord.Net.WebSocket/Entities/Guilds/SocketGuild.cs

@@ -45,6 +45,7 @@ namespace Discord.WebSocket
         public int DownloadedMemberCount { get; private set; }
         internal bool IsAvailable { get; private set; }
         public bool IsConnected { get; internal set; }
+        public ulong? ApplicationId { get; internal set; }
 
         internal ulong? AFKChannelId { get; private set; }
         internal ulong? EmbedChannelId { get; private set; }
@@ -212,6 +213,7 @@ namespace Discord.WebSocket
             MfaLevel = model.MfaLevel;
             DefaultMessageNotifications = model.DefaultMessageNotifications;
             ExplicitContentFilter = model.ExplicitContentFilter;
+            ApplicationId = model.ApplicationId;
 
             if (model.Emojis != null)
             {