[Todo] FC buttons

[samuelgrant]

Let's get the I am the FC buttons done next time you have a few minutes. They should work something like this:

• I'm the FC can be used to force the waitlist to update the FC object, so it can continue to use the token. If the token fails (Wrong FC) then don't delete the fleet, disable ESI actions for that fleet and display a banner prompting the new FC to press the button.
• Back seating FC button should have two states. One that allows you to set yourself as the backseat, and one that lets you remove yourself as the backseat.

@Makeshift let me know what you think

[samuelgrant]

Both the I am the FC button and the backseat button now work. This should allow the FCs to hand over fleet without issues.