Change how we handle seed codes

Rather than "normalize" seed codes to BCEX format (which causes issues
with delimiter usage in some scenarios), leave the seed code alone and
break its data out into fields that can/should be parsed instead.

main.py

@@ -234,13 +234,19 @@ def parse_SEED(data: str) -> dict[str, bool | str]:
 
     This is a fake section injected by the loader code. It contains nothing
     but the seed code and we derive from this if the randomizer is BCCE or
-    BCEX, and normalize the seed code to a standard format by undoing the
-    changes BCCE makes to it.
-    """
-    # Normalize seed codes to BCEX format, removing spaces and replacing pipes with dots
-    seed = data.replace("|", ".").replace(" ", "")
+    BCEX, and try to pluck out other data.
 
-    return {"is_bcce": data.startswith("CE"), "seed": seed}
+    We can't do much because the format is really hard to reverse.
+    """
+    version, mode, flags, seed_num = data.split("|") if "|" in data else data.split(".")
+    return {
+        "version": version,
+        "flags": flags,
+        "seed_num": seed_num,
+        "mode": mode,
+        "is_bcce": data.startswith("CE"),
+        "seed": data,
+    }
 
 
 def parse_SECRET_ITEMS(data: str) -> list[str]: