make TD mission objective punctuation consistent

[clemty]

some mission objectives end with ".", most don't - this removes the punctuation for consistency

some nod objectives end with an exclamation mark, I kept that even though it is inconsistent through nod missions as well

edit: I addded fullstops to all objectives and replaced exclamation marks in the process

[Unit158]

How about we end them all with periods instead of leaving some with exclamation points?

EDIT: I'm not really opposed to having it like this, so 👍 either way, I would just prefer periods.

[clemty]

I assumed that the default is "no punctuation" since that was the case in the majority of objectives, but a quick online search shows that punctuation like in sentences is apparently good style so you're right and there should be punctuation:

http://www.onlinegrammar.com.au/punctuation-in-lists/
http://www.getitwriteonline.com/archive/101406VerticalLists.htm

[abcdefg30]

Somehow I'd prefer fullstops, but above sounds reasonable, so 👍 / ✅

[obrakmann]

I'm in the "proper punctuation at all times, please"-camp.

[pchote]

Everyone seems to agree that punctuation is required.

[obrakmann]

You missed one in gdi03, but that's the objective for the AI player which is never shown anywhere, so 👍

[obrakmann]

Thanks!

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