Standardize on American spellings.

Full internationalization would be much cooler, but that's never going
to happen.  Given that, this will at least prevent folks from constantly
having to look and switch between typing "armor" and "armour", depending
on which zone each item originated in, etc.

I could flip these either way, but a survey of the current state shows
that about 80% of the mixed cases use the American spellings, while 20%
use the British.  And, most words *only* exist in this data in their
American forms.  So, it seems the majority prefer these spellings.

In case anyone likes trivia:
* The most common mixed words in here were "armour" and "colour", each of
  which occured about half as often as "armor" and "color", respectively.
* The most British word in here was "theatre" (including other forms),
  which occured about twice as often as "theater".

This stanardizes all of these (and other forms of these same words):
* armour -> armor
* colour -> color
* favour -> favor
* honour -> honor
* civilise -> civilize
* centre -> center
* theatre -> theater
* defence -> defense
* offence -> offense
* realise -> realize

lib/world/obj/74.obj

@@ -185,7 +185,7 @@ E
 heavy canvas bag~
    Constructed of heavy canvas, this bag is fairly large and comes with a
 large, overshoulder strap for easy carrying.  Unfortunately, wearing it would
-require giving up any body armour.
+require giving up any body armor.
 ~
 #7413
 bright copper oil lamp~
@@ -320,7 +320,7 @@ A pile of black cloth lies in the dirt.~
 E
 sweeping black cape~
    A cape of heavy cloth, this simple bit of finery is dyed a deep, shadowy
-black.  A rather unusual bit of clothing in that it is without colourful thread
+black.  A rather unusual bit of clothing in that it is without colorful thread
 or embroidery of any sort.
 ~
 A
@@ -384,7 +384,7 @@ A pair of blackened leggings lies here, smouldering.~
 E
 pair blackened chain leggings~
    Chain links woven together to make these sleeves have been damaged in a
-fire.  Black streaks cover the armour and the smell of charred flesh is heavily
+fire.  Black streaks cover the armor and the smell of charred flesh is heavily
 soaked into the blackened linen lining.
 ~
 A
@@ -446,7 +446,7 @@ A breastplate of blue steel lies here, glowing softly.~
 E
 fine bluesteel steel blue breastplate~
    This breastplate is a gorgeous piece of work.  Crafted of fine bluesteel, an
-ore from deep in the mountains, the armour is both functional and beautiful.
+ore from deep in the mountains, the armor is both functional and beautiful.
 Age may have caused some breakdown in the metal, but it seems strong.
 ~
 #7430