extension updates for splat update

tools/splat.yaml

@@ -7,7 +7,8 @@ options:
   ld_o_replace_extension: False
   ld_addrs_header: include/ld_addrs.h
   extensions: splat_ext
-  symbol_addrs: tools/symbol_addrs.txt
+  symbol_addrs_path: tools/symbol_addrs.txt
+  platform: n64
 segments:
   - name: header
     type: header

tools/splat_ext/PaperMarioMapFS.py

@@ -1,7 +1,7 @@
 import os
-from segtypes.segment import N64Segment
+from segtypes.n64.segment import N64Segment
 from pathlib import Path
-from util import Yay0decompress
+from util.n64 import Yay0decompress
 
 
 def decode_null_terminated_ascii(data):

tools/splat_ext/PaperMarioMessages.py

@@ -1,4 +1,4 @@
-from segtypes.segment import N64Segment
+from segtypes.n64.segment import N64Segment
 from pathlib import Path
 
 CHARSET = {

tools/splat_ext/PaperMarioNpcSprites.py

@@ -1,6 +1,6 @@
-from segtypes.segment import N64Segment
+from segtypes.n64.segment import N64Segment
 from pathlib import Path
-from util import Yay0decompress
+from util.n64 import Yay0decompress
 from util.iter import iter_in_groups
 from util.color import unpack_color
 import png