Basic font settings.

Include a default value getter in the store in order to make the
default value easy to work with.

src/settings/SettingsStore.js

@@ -370,6 +370,20 @@ export default class SettingsStore {
         return SettingsStore._getFinalValue(setting, level, roomId, null, null);
     }
 
+    /**
+     * Gets the default value of a setting.
+     * @param {string} settingName The name of the setting to read the value of.
+     * @return {*} The value, or null if not found
+     */
+    static getDefaultValue(settingName, roomId = null, excludeDefault = false) {
+        // Verify that the setting is actually a setting
+        if (!SETTINGS[settingName]) {
+            throw new Error("Setting '" + settingName + "' does not appear to be a setting.");
+        }
+
+        return SETTINGS[settingName].default;
+    }
+
     static _getFinalValue(setting, level, roomId, calculatedValue, calculatedAtLevel) {
         let resultingValue = calculatedValue;