Completely wire vocab words in YAML to the code.

This massive patch:
* Finishes working all the vocab words into YAML structures.
* Adds vocab ID generator functions.
* Redoes the input-getting system, removing the need for GETIN(),
  GETTXT(), etc.
* Changes advent<->ascii mapping to avoid the special 'shift'
  character.
* Works around some bad behavior in the dragon attack logic.
* Handles the reservoir magic word without changing the database
  contents.

cheat.c

@@ -81,7 +81,7 @@ int main(int argc, char *argv[])
     /*  Initialize game variables */
     initialise();
 
-    game.zzword = rndvoc(3, 0);
+    make_zzword(game.zzword);
     game.newloc = LOC_START;
     game.loc = LOC_START;
     game.limit = GAMELIMIT;