_s: simplifying functions.php by making some of the stuff happening there modular with functions being called in templates showing up in template-tags.php, little extras that won't produce a visible error if they're missing in tweaks, and wpcom stuff in wpcom

inc/wpcom.php

@@ -0,0 +1,18 @@
+<?php
+/**
+ * WordPress.com-specific functions and definitions
+ *
+ * @package _s
+ * @since _s 1.0
+ */
+
+/**
+ * Set a default theme color array for WP.com.
+ *
+ * @since _s 1.0
+ */
+$themecolors = array(
+	'bg' => 'ffffff',
+	'border' => 'eeeeee',
+	'text' => '444444',
+);