Better changelog parsing

When merging live firmwares, override the changelogs instead of
appending to them to avoid cases like
b61e378.
Use lxml in parse_changes() instead of a regex to avoid edge cases such
as 236bdae.

firmwares_live.json

@@ -2718,9 +2718,7 @@
     "firmware_id": 434,
     "model": "E1 Outdoor Pro",
     "hw_ver": "IPC_560SD88MP",
-    "changelog": [
-      ""
-    ],
+    "changelog": [],
     "display_time": "2023-08-29 00:00:00+08:00",
     "sha256_pak": "17082f0ee33a7e035497e1078ea3ff863123cd867580adbc46eeade4595dcb66",
     "source": "live"

main.py

@@ -165,9 +165,8 @@ def sanitize(string: str) -> str:
 
 def parse_changes(text: str) -> list[str]:
     text = sanitize(text)
-    text = text.removeprefix("<p>").removesuffix("</p>")
-    text = text.removeprefix("<P>").removesuffix("</P>")
-    return re.split("\s*</?[pP]>\s*<[pP]>\s*|\s*<br />\s*", text)
+    frag = fragment_fromstring(text, True)
+    return [text.strip() for text in frag.itertext() if text.strip()]
 
 
 def parse_timestamps(display_time: int, updated_at: int) -> tuple[datetime, datetime]:
@@ -406,6 +405,8 @@ def merge_dicts(old: MutableMapping[Any, Any], new: Mapping[Any, Any]) -> None:
             if key in ("productImg", "productUrl"):  # For device merging.
                 if val:  # Avoid replacing manually set value by an empty live value.
                     old[key] = val
+            elif key == "changelog":  # For live firmware merging.
+                old[key] = val
             elif isinstance(val, dict):
                 if not isinstance(old.get(key), dict):
                     old[key] = {}