[Conf] Warning when Later is pressed w/ spoil set selected

[Flow520]

Concise description:

• Quite a few times, I have selected three spoils and then mistakenly hit the Later button instead of the Trade button.
• Just as there is a warning if one tries to trade an invalid selection of spoils, there should also be a warning if one selects a valid set of spoils and then hits the later button.

Specifics/Details:

• Current State:
• If a valid set of spoils is selected and "Later" is pressed, the trade window vanishes and the player is forced into the deploy phase. Rage/sadness/embarrassment may ensue.
• Suggested Change:
• If a valid set of spoils is selected and "Later" is pressed, an “Are you sure?” pop-up warning is displayed.

How this will benefit the site and/or other comments:

• It will ease frustration caused by simple mistakes.
• I’m not a programmer, however I think this could be very simple to implement by copying and slightly modifying preexisting code. Specifically, the code for the warning if one tries to trade an invalid selection of spoils. (See spoiler)

[spoiler=Example_Code_Modification]Preexisting Code-----------------------------------------------------
Trade is pressed:
If set valid
---> Preform set trade
Else
---> Give warning
Later is pressed:
---> Continue to deploy phase
-------------------------------------------------------------------------

Suggested Code Modification for Later Button
Later is pressed:
If set valid
---> Give warning
Else
---> Continue to deploy phase[/spoiler]

[macbone]

As long as it could be switched on/off, this would be a good idea to implement.

[Foxglove]

This seems like a reasonable notification to add (an optional one).

[Dukasaur]

Yeah, makes sense. There are already confirmation buttons for end of turn, etc. This seems like a logical expansion of the same thing.