Copy utils from cytube-common and remove dep

The `cytube-common` module was created as part of a now-defunct
experiment and since then has just remained a crufty container for a few
utils.  Moved the utils to the main repo and removed the dependency.

src/configuration/configloader.js

@@ -0,0 +1,19 @@
+import toml from 'toml';
+import fs from 'fs';
+
+/** @module cytube-common/configuration/configloader */
+
+/**
+ * Load a toml file and pass the results to a configuration
+ * constructor.
+ *
+ * @param {function} constructor Constructor to call with the loaded data
+ * @param {string} filename Path to the toml file to load
+ * @returns {Object} Configuration object constructed from the provided constructor
+ * @throws {SyntaxError} Errors propagated from toml.parse()
+ */
+export function loadFromToml(constructor, filename) {
+    const rawContents = fs.readFileSync(filename).toString('utf8');
+    const configData = toml.parse(rawContents);
+    return new (constructor)(configData);
+}