Add Timewarrior config for iceowl (macOS support)

This commit adds a configuration for the new `iceowl` host. Due to the
usage of absolute paths in the config files of Timewarrior (1) e.g. for
the color theme, there must be an config per host.

References:

  (1) https://timewarrior.net

Epic: GH-131
Closes GH-144

snowblocks/timewarrior/snowblock.json

@@ -1,25 +1,21 @@
 [
   {
-    "clean": [
-      "~",
-      "~/.timewarrior"
-    ]
+    "clean": ["~/.timewarrior"]
   },
   {
     "link": {
       "~/.timewarrior/timewarrior.cfg": {
         "create": true,
         "force": true,
         "hosts": {
+          "iceowl": "timewarrior.cfg.iceowl",
           "igloo": "timewarrior.cfg.igloo"
         }
       },
       "~/.timewarrior/nord.theme": {
         "create": true,
         "force": true,
-        "hosts": {
-          "igloo": "nord.theme"
-        }
+        "path": "nord.theme"
       }
     }
   }

snowblocks/timewarrior/timewarrior.cfg.archbook → snowblocks/timewarrior/timewarrior.cfg.iceowl

@@ -1,5 +1,5 @@
-# Copyright (C) 2016-present Arctic Ice Studio <development@arcticicestudio.com>
-# Copyright (C) 2016-present Sven Greb <development@svengreb.de>
+# Copyright (c) 2016-present Arctic Ice Studio <development@arcticicestudio.com>
+# Copyright (c) 2016-present Sven Greb <code@svengreb.de>
 
 # Project:    igloo
 # Repository: https://github.com/arcticicestudio/igloo
@@ -11,7 +11,7 @@
 #+----+
 #+ UI +
 #+----+
-import /home/sgreb/.timewarrior/nord.theme
+import /Users/sgreb/.timewarrior/nord.theme
 color = true
 
 #+---------+