New and improved Token set UI. This should make it easier to manage many token sets.

- Moved JSON tab to the Tokens tab as a subview.

- Moved Export / Load to the bottom bar and consolidated Style actions.

- Removed Clear function for now.

You can now sort tokens! You can sort all tokens that are not named with a number (e.g. 100, 200) in the UI. Tokens with names that start with a number will always come first. Thanks @srinivas0210

Changing token sets while having unsaved changes in JSON tab will now yield a confirm dialog.

GitHub Sync: Fixed an issue with non-latin characters. You should now be able to specify tokens with characters that previously had bad encoding, e.g. emojis or cyrillic. Thanks @srinivas0210