Minor bug fixes (#2128)

- make sure bsp is processed on `l` levels in extraction (caused missing
remaps)
- clean up a few prints in extraction
- handle the <15 byte differences in art group files automatically (no
more errors about file naming)
- fix potential exception thrown by merc2 in a few ways: fixed bad data
in FR3's, check texture index just in case, and handle exceptions a
little bit better (still a crash, but at least you get a print)
- fix mips2 ocean stuff causing ocean far crashes

decompiler/analysis/insert_lets.cpp

@@ -2047,7 +2047,7 @@ FormElement* rewrite_with_dma_buf_add_bucket(LetElement* in, const Env& env, For
 
   last_part = dynamic_cast<LetElement*>(in->body()->at(in->body()->size() - 1));
   if (!last_part) {
-    lg::error("NO LAST PART AHH wtf!!");
+    // lg::error("NO LAST PART AHH wtf!!");
     return nullptr;
   }