Keep gfx.py with other tools, and remove its dependency on the 'extras' submodule

tools/gfx.py

@@ -3,7 +3,7 @@
 import os
 import argparse
 
-from extras.pokemontools import gfx, lz
+from pokemontools import gfx, lz
 
 
 # Graphics with inverted tilemaps that aren't covered by filepath_rules.
@@ -146,7 +146,7 @@ def filepath_rules(filepath):
 
     pokemon_name = ''
 
-    if 'gfx/pics/' in filedir:
+    if 'gfx/pokemon/' in filedir:
         pokemon_name = filedir.split('/')[-1]
         if pokemon_name.startswith('unown_'):
             index = filedir.find(pokemon_name)

tools/pokemontools/__init__.py

@@ -0,0 +1 @@
+# A subset of https://github.com/pret/pokemon-reverse-engineering-tools