feat(playout): use liquidsoap version functions

- remove "packaging" package

playout/libretime_playout/liquidsoap/version.py

@@ -0,0 +1,26 @@
+import re
+from subprocess import PIPE, run
+from typing import Tuple
+
+LIQUIDSOAP_VERSION_RE = re.compile(r"(?:Liquidsoap )?(\d+).(\d+).(\d+)")
+LIQUIDSOAP_MIN_VERSION = (1, 1, 1)
+
+
+def parse_liquidsoap_version(version: str) -> Tuple[int, int, int]:
+    match = LIQUIDSOAP_VERSION_RE.search(version)
+
+    if match is None:
+        return (0, 0, 0)
+    return (int(match.group(1)), int(match.group(2)), int(match.group(3)))
+
+
+def get_liquidsoap_version() -> Tuple[int, int, int]:
+    cmd = run(
+        ("liquidsoap", "--check", "print(liquidsoap.version) shutdown()"),
+        check=True,
+        stdout=PIPE,
+        stderr=PIPE,
+        universal_newlines=True,
+    )
+
+    return parse_liquidsoap_version(cmd.stdout)