Tolerate unparseable mod payloads in load_payloads()

[bradyccox]

Problem

FlyingType.load_payloads() catches SyntaxError but lets ValueError propagate. Some third-party mod payload Lua files (e.g. the CJS Super Hornet v2.4) use local variable names as table indices ([OBL], [JML], …), which the Lua parser can't represent — lua.loads() raises ValueError ("could not convert string to float: ''"). A single such file currently aborts payload loading for every aircraft in the install.

Fix

Skip the offending file with a warning, mirroring the existing SyntaxError-tolerant path, so one malformed mod payload no longer breaks loadouts for the whole install.

except ValueError:
    logging.getLogger("pydcs").warning(
        "Skipping payload file with unsupported Lua syntax: %s", payload_path
    )
    continue

Verified that lua.loads() raises exactly ValueError on local-variable table indices.

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