Added reset/load/save settings

[DarkMatterMatt]

Added reset/load/save settings

Settings page:

• Added reset settings button (resets to default)
• Added save/load custom settings button (stored in localStorage.settings) Save/load buttons are hidden when localStorage is no accessible Load button is hidden when there is nothing to load

loadSettings now loads saved custom settings by default if all settings are default (if the user likes the default settings, then they can save default settings as custom settings so they aren't forced off the default settings or they can simply not save the custom settings)

[filipre]

Any updates on this? It probably needs a new review but is there any reason not to merge?