Added DBCache

Currently incomplete. This feature will maintain a cache of
entities in a database to be used by upcoming features and
possible external utilities to be created in the future.

Feature/DBCache/DBCache.cs

@@ -0,0 +1,74 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Threading.Tasks;
+using Discord.WebSocket;
+using Newtonsoft.Json.Linq;
+
+namespace Noikoio.RegexBot.Feature.DBCache
+{
+    /// <summary>
+    /// Caches information regarding all incoming messages and all known guilds, channels, and users.
+    /// The function of this feature should be transparent to the user, and thus no configuration is needed.
+    /// </summary>
+    class DBCache : BotFeature
+    {
+        public override string Name => "Database cache";
+        
+        public DBCache(DiscordSocketClient client) : base(client)
+        {
+            client.GuildAvailable += Client_GuildAvailable;
+            client.GuildUpdated += Client_GuildUpdated;
+            client.GuildMemberUpdated += Client_GuildMemberUpdated;
+
+            client.MessageReceived += Client_MessageReceived;
+            client.MessageUpdated += Client_MessageUpdated;
+        }
+
+        public override Task<object> ProcessConfiguration(JToken configSection) => Task.FromResult<object>(null);
+
+        #region Guild and user cache
+        /* Note:
+         * We save information per guild in their own schemas named "g_NUM", where NUM is the Guild ID.
+         * 
+         * The creation of these schemas is handled within here, but we're possibly facing a short delay
+         * in the event that other events that we're listening for come in without a schema having been
+         * created yet in which to put them in.
+         * Got to figure that out.
+         */
+
+        // Guild information has changed
+        private Task Client_GuildUpdated(SocketGuild arg1, SocketGuild arg2)
+        {
+            throw new NotImplementedException();
+        }
+
+        // Single guild member information has changed
+        private Task Client_GuildMemberUpdated(SocketGuildUser arg1, SocketGuildUser arg2)
+        {
+            // which is old and which is new?
+            throw new NotImplementedException();
+        }
+
+            // All member data in a guild has become known
+        private Task Client_GuildAvailable(SocketGuild arg)
+        {
+            throw new NotImplementedException();
+        }
+        #endregion
+
+        #region Message cache
+        private Task Client_MessageUpdated(Discord.Cacheable<Discord.IMessage, ulong> arg1, SocketMessage arg2, ISocketMessageChannel arg3)
+        {
+            throw new NotImplementedException();
+        }
+
+        private Task Client_MessageReceived(SocketMessage arg)
+        {
+            throw new NotImplementedException();
+        }
+        #endregion
+
+
+    }
+}

RegexBot.cs

@@ -47,7 +47,8 @@ namespace Noikoio.RegexBot
             {
                 new Feature.AutoMod.AutoMod(_client),
                 new Feature.ModTools.ModTools(_client),
-                new Feature.AutoRespond.AutoRespond(_client)
+                new Feature.AutoRespond.AutoRespond(_client),
+                new Feature.DBCache.DBCache(_client)
             };
             var dlog = Logger.GetLogger("Discord.Net");
             _client.Log += async (arg) =>

RegexBot.csproj

@@ -17,6 +17,7 @@
   <ItemGroup>
     <PackageReference Include="Discord.Net" Version="1.0.2" />
     <PackageReference Include="Newtonsoft.Json" Version="10.0.3" />
+    <PackageReference Include="Npgsql" Version="3.2.5" />
     <PackageReference Include="System.ValueTuple" Version="4.4.0" />
   </ItemGroup>