Overhauled settings popup
- Can switch between light and dark mode for the settings popup
- Split settings into their own collapsible categories
- Made the various slider toggles look a lot nicer
- You can now disable every feature individually (unless I missed some), letting you customize the stats you see. This should save between browser sessions. You will need to refresh the page to apply your new settings.

Fixed an issue where the class stats panels on the profile page would have all of their text forced bold, instead of only table headers being bolded.

Forces the playtime seconds in the log list's class stats field to be two characters, instead of being only one character if the value was a single digit (12:9 -> 12:09)