graphics: Add new Freedoom font.

This replaces the old Freedoom font with a new chunky one named "Denex".
I (fraggle) have split the font out into separate images for use with
the textgen script, but have included the original source .pcx image
here.

Currently the font only includes uppercase characters and does not
include smaller lowercase ones, so I've hacked the textgen script to
convert all strings to uppercase before rendering. There are also no
font kerning rules for the time being.

graphics/text/font/README

@@ -0,0 +1,6 @@
+This font is by Brett Harrell (Mechadon) and is named "Denex". It is
+based on an earlier font named Deneb. Some information can be found
+in this thread:
+
+http://www.doomworld.com/vb/freedoom/69080-new-font-candidate/
+

graphics/text/font/font_readme.txt

@@ -1,17 +0,0 @@
-========================================================================
-
-Contributed by Andrew Apted <ajapted@users.sourceforge.net>
-
-FreeDOOM font images (for art directory).
-
-Font was drawn from scratch, scanned, edited, shaded, scaled to 12 
-and 15 pixels high, then colored (except for the "RAW" versions).
-
-The original 30 pixel high (RAW) version is included.
-
-Note that the `Q' character is an exception, and extends a few pixels
-below the normal height.  There's also a few missing characters,
-mainly the exclamation mark `!', comma, and apostrophe, which I fudged
-up when they were needed.
-
-========================================================================