added a monster spawner and modified lvl mechanics

Monsters have a weighting on how many to spawn and roll which
specific monster to spawn from the pool. I have not added the
ability to advance levels yet, though that should work to
add monsters if the Floor number advances. I did notice a bug
where the player cannot be harmed by the monsters unless the
player moves into them, not the other way around. The monsters
seem to treat the player as a wall that cannot be passed through.
This is confusing because the code for the player and monsters match
as far as their ability to move into each other...

projectile.py

@@ -1,3 +1,9 @@
+# projectile.py
+# ------------
+# By Pat Wick
+# This module defines a "casted" projectile. This is the basis
+# for ranged character types' attacks.
+
 from retro.game import Game
 
 class Projectile:
@@ -13,10 +19,18 @@ class Projectile:
                 self.character = "-"
             elif self.direction in [(0,1), (0,-1)]:
                 self.character = "|"
+        if game.get_agent_by_name("player").class_ == "Warrior":
+            if self.direction in [(0,1), (0,-1)]:
+                self.character = "|"
+            elif self.direction == (1,0):
+                self.character = "/"
+            else:
+                self.character = "\\"
 
     def move(self, game):
         """Try to move in direction set by player when launched. If blocked,
-        disappear."""
+        disappear. If projectile hits an enemy, lower hp by damage.
+        """
         dx, dy = self.direction
         new_position = (self.position[0] + dx, self.position[1] + dy)
         if game.on_board(new_position):
@@ -34,8 +48,16 @@ class Projectile:
             game.remove_agent(self)
 
     def play_turn(self,game):
+        """Speed of projectiles depends on character race.
+        """
         if game.turn_number % self.speed == 0:
             self.move(game)
+            try:
+                if game.get_agent_by_name("player").class_ == "Warrior":
+                    game.remove_agent(self)
+            except:
+                pass
+            
 
     def get_agent_in_position(self, position, game):
         """Returns an agent at the position, or returns None.