Apply official naming guidelines to Octobot (#306)

1. The root namespace was changed from `Octobot` to
`TeamOctolings.Octobot`:
> DO prefix namespace names with a company name to prevent namespaces
from different companies from having the same name.
2. `Octobot.cs` was renamed to `Program.cs`:
> DO NOT use the same name for a namespace and a type in that namespace.
3. `IOption`, `Option` were renamed to `IGuildOption` and `GuildOption`
respectively:
> DO NOT introduce generic type names such as Element, Node, Log, and
Message.
4. `Utility` was moved out of the `Services` namespace. It didn't belong
there anyway
5. `Program` static fields were moved to `Utility`
6. Localisation files were moved back to the project source files. Looks
like this fixed `Message.Designer.cs` code generation

---------

Signed-off-by: Octol1ttle <l1ttleofficial@outlook.com>

TeamOctolings.Octobot/Data/GuildData.cs

@@ -0,0 +1,47 @@
+using System.Text.Json.Nodes;
+using Remora.Rest.Core;
+
+namespace TeamOctolings.Octobot.Data;
+
+/// <summary>
+///     Stores information about a guild. This information is not accessible via the Discord API.
+/// </summary>
+/// <remarks>This information is stored on disk as a JSON file.</remarks>
+public sealed class GuildData
+{
+    public readonly Dictionary<ulong, MemberData> MemberData;
+    public readonly string MemberDataPath;
+
+    public readonly Dictionary<ulong, ScheduledEventData> ScheduledEvents;
+    public readonly string ScheduledEventsPath;
+    public readonly JsonNode Settings;
+    public readonly string SettingsPath;
+
+    public readonly bool DataLoadFailed;
+
+    public GuildData(
+        JsonNode settings, string settingsPath,
+        Dictionary<ulong, ScheduledEventData> scheduledEvents, string scheduledEventsPath,
+        Dictionary<ulong, MemberData> memberData, string memberDataPath, bool dataLoadFailed)
+    {
+        Settings = settings;
+        SettingsPath = settingsPath;
+        ScheduledEvents = scheduledEvents;
+        ScheduledEventsPath = scheduledEventsPath;
+        MemberData = memberData;
+        MemberDataPath = memberDataPath;
+        DataLoadFailed = dataLoadFailed;
+    }
+
+    public MemberData GetOrCreateMemberData(Snowflake memberId)
+    {
+        if (MemberData.TryGetValue(memberId.Value, out var existing))
+        {
+            return existing;
+        }
+
+        var newData = new MemberData(memberId.Value);
+        MemberData.Add(memberId.Value, newData);
+        return newData;
+    }
+}