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/277.obj

@@ -156,7 +156,7 @@ A golden sunflower blooms here.~
 1 1 0 0 0
 E
 sunflower golden flower~
-   This large flower is the bright golden yellow colour of sunshine, beautiful
+   This large flower is the bright golden yellow color of sunshine, beautiful
 splayed petals surrounding the dark seeded center, providing a source of
 nourishment as well as beauty.
 ~
@@ -416,7 +416,7 @@ A plate of smoked mackerel has been set here.~
 1 25 0 0 0
 E
 plate smoked mackerel~
-   Creamy coloured mackerel meat has been cooked and mashed together with melted
+   Creamy colored mackerel meat has been cooked and mashed together with melted
 butter to make a creamy pate.  This has been sprinkled with ground black pepper
 and served with a tiny dollop of horseradish sauce and a crisp green side of
 salad.
@@ -547,7 +547,7 @@ A piece of lemon cake sits here.~
 1 15 0 0 0
 E
 piece lemon cake~
-   This deliciously sweet and lemony piece of cake is a delicate yellow colour,
+   This deliciously sweet and lemony piece of cake is a delicate yellow color,
 sprinkled with powdered sugar and zest of lemon, and baked until light and
 fluffy.
 ~
@@ -681,7 +681,7 @@ daisy chain~
 E
 daisy chain~
    This pretty little chain is made up of flowers as white as pure snow, their
-beautifully fragranced centers the colour of golden streaming sunshine.
+beautifully fragranced centers the color of golden streaming sunshine.
 ~
 #27752
 sweeping green skirt~
@@ -724,7 +724,7 @@ light yellow skirt~
 2 120 0 0 0
 E
 light yellow skirt~
-   This brightly coloured skirt is made from a very fragile and airy material,
+   This brightly colored skirt is made from a very fragile and airy material,
 delicate veins of gold embroidered here and there and sparkling in any light.
 ~
 A