cacheRoutesGmap: read raw plist to avoid nska_deserialize 'unhashable' warnings

[abrignoni]

Problem

Running Google Maps Cache Routes floods the log with unhashable NSKeyedArchiver warnings — one per CachedRoutes file.

Root cause

The artifact walks the raw $objects array itself (entry['_coordinateLat']), but it read each file via get_plist_file_content, which — for NSKeyedArchiver plists — routes through nska_deserialize (ilapfuncs.py:641):

if plist_content.get('$archiver','') == 'NSKeyedArchiver':
    return nska_deserialize.deserialize_plist(file_path)

These CachedRoutes archives contain unhashable NSDictionary keys, so the deserializer emits the unhashable warnings. Worse, that call is counterproductive: deserialization strips the $objects array, which is exactly what this artifact reads — so the deserialize step is pure cost.

Fix

Read the raw plist directly with plistlib.load and skip the deserializer entirely. No nska_deserialize call ⇒ no warnings, and $objects is present as the code already expects (so it's also more correct, not just quieter).

Also

Re-enables KML output (output_types: "all"). cacheRoutesGmap was pulled out of the KML batch (#1624) solely because of these warnings; with the warnings fixed, it rejoins. It has exact Latitude/Longitude columns, so kmlgen now produces a KML.

Verify

pylint 10.00/10, py_compile OK, audit confirms it's KML-producing. Note: get_plist_file_content/nska now appear only in an explanatory code comment, not in any code path.