Added an overpowered eagle boss. To avoid seing it too often, entities now have a certain chance of being spawned. Closes #19.

squirrelbattle/display/texturepack.py

@@ -30,6 +30,7 @@ class TexturePack:
     TEDDY_BEAR: str
     TIGER: str
     WALL: str
+    EAGLE: str
 
     ASCII_PACK: "TexturePack"
     SQUIRREL_PACK: "TexturePack"
@@ -76,6 +77,7 @@ TexturePack.ASCII_PACK = TexturePack(
     TEDDY_BEAR='8',
     TIGER='n',
     WALL='#',
+    EAGLE='µ',
 )
 
 TexturePack.SQUIRREL_PACK = TexturePack(
@@ -103,4 +105,5 @@ TexturePack.SQUIRREL_PACK = TexturePack(
     TEDDY_BEAR='🧸',
     TIGER='🐅',
     WALL='🧱',
+    EAGLE='🦅',
 )