Overhaul logging

Provide a proper logging effect that filters messages by log level
before generating them.

src/Runner.md

@@ -1,4 +1,3 @@
-<!-- markdown-toc start - Don't edit this section. Run M-x markdown-toc-refresh-toc -->
 **Table of Contents**
 
 - [Unified interface for any day from any year](#unified-interface-for-any-day-from-any-year)
@@ -14,8 +13,6 @@
     - [Methods](#methods)
         - [locate](#locate)
 
-<!-- markdown-toc end -->
-
 # Unified interface for any day from any year
 
 This module provides some basic data types for building an application containing all my solutions to all of the parts of all the days across all of the years.
@@ -28,6 +25,8 @@ module Runner
 import Control.Eff
 import Structures.Dependent.FreshList
 
+import public Util.Eff
+
 %default total
 ```
 
@@ -43,7 +42,7 @@ A `Writer` effect is provided for logging, and a `Reader` effect is provided to
 public export
 PartEff : (err : Type) -> List (Type -> Type)
 PartEff err =
-  [IO, Except err, WriterL "log" String, ReaderL "input" String]
+  [IO, Except err, Logger, ReaderL "input" String]
 ```
 
 # The `Day` Record