Fix typo
rewrote the calendar
The Mayans may get angry, but now the calendar is using only the turn_number as time variable and deriving everything else from there.
You can still change the derived variables directly, but you shouldn't. Instead you should add or remove the appropriate amount of time either in turns or with another calendar object.
If there are things that access the calendar in this deprecated way, they'll have to be changed, but thay may still work even under this system, so maybe making this variables private and adding proper accessors for every each one would be more advisable; but then anything that reads this variables needs to be changed, not just what writes.
I expect the sunrise and sunset functions to work right, but they need specific testing, besides testing everything else ever that uses the calendar.
Hopefully that's all that needs to be done and it was isolated enough.
fix death screen showing the wrong amount of days survived
removed set_season as it makes no sense anyway
Input manager for advanced inventory
Remove useless comments
Remove double UP/DOWN keys for adv. inventory
Fixes more extraneous code
Move motd and credits declarations outside of game::opening screen
Added refresh funcitions for motd and credits files.
All variables and functions have prefix mmenu_*.
Refresh motd/credits after lang change. Dynamically.
Added oversight, lying down now uses clothing around you
Merge pull request #8600 from Shoes01/lying-down-warmth-fix

Added oversight, lying down now uses clothing around you
Blocking the Road

OK, got the barricades in place and a miltruck set.  Still WIP.
Anti-materiel turret!

I said I'd make a .50BMG turret.  Single-shot antimateriel, damage is
surprisingly variable.  :-/
Doxygen doc fixes.
Some mising /ref changed to <B></B>.
Added missing @param's
Added missing newlined between functions defs.
Rubble more
Rubble final
Raise move costs to account for no dis slowdown
Small text change