Do some more file format spelunking

`WarHammer.ani` turns out to be a regular `obj` file; `WarHammer.idx`
is partially decoded, but I'm struggling to link it to the former in
a reasonable way at the moment.

scripts/try-uncompress

@@ -499,7 +499,23 @@ def build(filename)
   File.open(filename, "w") { |f| f.write(built.to_data) }
 end
 
+def unknown16(filenames)
+  objs = filenames.map { |f| load_obj(f) }
+  results = Set.new
+
+  objs.each do |obj|
+    obj.sprites.each do |spr|
+      results << spr.header.unknown16
+    end
+  end
+
+  puts "Unique widths for u16,4"
+  pp results
+end
+
 case command = ARGV.shift
+when "unknown16" then
+  unknown16(ARGV)
 when "sprites" then
   ARGV.each { |filename| sprites(filename) } 
 when "sprite" then