Rename wingames.lst to gamedesc.txt, and add a couple of extra fields

to it giving each game's "internal" name (as seen in the source file,
.R etc) and also a brief description of the game. The idea of the
latter is that it should be usable as a comment field in .desktop
files and similar.

[originally from svn r9858]

pattern.R

@@ -17,6 +17,6 @@ GAMES += pattern
     A(pattern) \
 !end
 
-!begin >wingames.lst
-pattern.exe:Pattern
+!begin >gamedesc.txt
+pattern:pattern.exe:Pattern:Pattern puzzle
 !end