Add descriptions for all the Free Merchant NPC missions.

[Petethegoat]

Summary

SUMMARY: Content "Add mission descriptions for Free Merchant faction missions, and fix the two jar-related missions."

Purpose of change

Utilize the new functional mission descriptions (from #32778) to make sure relevant information (eg. rewards 💵) is available to the player after they exit dialogue.

While I was there, I adjusted some of the names for variety, and fixed the last two FMC missions being uncompletable because they were looking for non-existent item groups instead of items.
Also migrated the cigarette mission definition into the guard's json file.

Additional Context

Against my better judgement, I did not adjust the pitiful rewards. 25 merch for 100 god damn jars. 😡

[Night-Pryanik]

I think there's no need in mentioning exact number of merch in mission descriptions because if we want to balance their amount somewhere in the future, we would need to update the descriptions too instead of updating only the u_buy_item field.

[ZhilkinSerg]

I think there's no need in mentioning exact number of merch in mission descriptions because if we want to balance their amount somewhere in the future, we would need to update the descriptions too instead of updating only the u_buy_item field.

I agree. And it would be nice to implement some string tokens usable in text to display values of mission parameters dynamically.

[Petethegoat]

Agreed. I'll look into adding some tokens to show that dynamically, and if that's too hard I'll just remove the amounts.