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/Attributes/StaticCallersOnlyAttribute.cs

@@ -0,0 +1,8 @@
+namespace TeamOctolings.Octobot.Attributes;
+
+/// <summary>
+/// Any property marked with <see cref="StaticCallersOnlyAttribute"/> should only be accessed by static methods.
+/// Such properties may be used to provide dependencies where it is not possible to acquire them through normal means.
+/// </summary>
+[AttributeUsage(AttributeTargets.Property)]
+public sealed class StaticCallersOnlyAttribute : Attribute;