Account Creation in AdminCP

[DDynamic]

This allows accounts to be created in the Admin Control Panel. It was tested manually.

@DaneEveritt remember to add in UUID checking when you get a chance.

[DaneEveritt]

You don't need to define this as User since it is implied that it is User by the namespace. If it was say Pterodactyl\Models\LongUserNamespaceKindaVague you could tack on as User to make it easier to write and read.

[DaneEveritt]

In addition to those line specific notes, you're using double quotes (") in the JS, I'd prefer we stick to the standard of single quotes (') for the JS.

You're also using tabs in place of 4 spaces.

Thanks for the PR, I'll pull it once we get that stuff fixed!