Added .eval command. Very dangerous, don't use.

src/NadekoBot/data/aliases.yml

@@ -1305,4 +1305,6 @@ patron:
   - patron
 patronmessage:
   - patronmessage
-  - patronmsg
+  - patronmsg
+eval: 
+  - eval

src/NadekoBot/data/strings/commands/commands.en-US.yml

@@ -2215,3 +2215,17 @@ patronmessage:
   desc: "Sends a message to all patrons of the specified tier and higher. Supports embeds."
   args:
     - "x hello"
+eval:
+  desc: |- 
+    Execute arbitrary C# code and (optionally) return a result. Several namespaces are included by default.
+    Special variables available: 
+    `self` - Instance of the command group executing the command (this)
+    `guild` - Server in which the command is executed
+    `channel` - Channel in which the command is executed
+    `user` - User executing the command
+    `ctx` - Discord.Net command context
+    `services` - Nadeko's IServiceProvider
+  args:
+    - "123 / 4.5f"
+    - "await ctx.OkAsync();"
+    - 'await ctx.SendConfirmAsync("uwu");'