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/Options/GuildOption.cs

@@ -0,0 +1,57 @@
+using System.Text.Json.Nodes;
+using Remora.Discord.Extensions.Formatting;
+using Remora.Results;
+
+namespace TeamOctolings.Octobot.Data.Options;
+
+/// <summary>
+///     Represents a per-guild option.
+/// </summary>
+/// <typeparam name="T">The type of the option.</typeparam>
+public class GuildOption<T> : IGuildOption
+    where T : notnull
+{
+    protected readonly T DefaultValue;
+
+    public GuildOption(string name, T defaultValue)
+    {
+        Name = name;
+        DefaultValue = defaultValue;
+    }
+
+    public string Name { get; }
+
+    public virtual string Display(JsonNode settings)
+    {
+        return Markdown.InlineCode(Get(settings).ToString() ?? throw new InvalidOperationException());
+    }
+
+    /// <summary>
+    ///     Sets the value of the option from a <see cref="string" /> to the provided JsonNode.
+    /// </summary>
+    /// <param name="settings">The <see cref="JsonNode" /> to set the value to.</param>
+    /// <param name="from">The string from which the new value of the option will be parsed.</param>
+    /// <returns>A value setting result which may or may not have succeeded.</returns>
+    public virtual Result Set(JsonNode settings, string from)
+    {
+        settings[Name] = from;
+        return Result.Success;
+    }
+
+    public Result Reset(JsonNode settings)
+    {
+        settings[Name] = null;
+        return Result.Success;
+    }
+
+    /// <summary>
+    ///     Gets the value of the option from the provided <paramref name="settings" />.
+    /// </summary>
+    /// <param name="settings">The <see cref="JsonNode" /> to get the value from.</param>
+    /// <returns>The value of the option.</returns>
+    public virtual T Get(JsonNode settings)
+    {
+        var property = settings[Name];
+        return property != null ? property.GetValue<T>() : DefaultValue;
+    }
+}