Cache vCard aliases in a hash table, not in deprecated handle qdata
Cache vCard aliases in a hash table, not in deprecated handle qdata

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=69194
Reviewed-by: Xavier Claessens <6f61b6f8ca6f7cbeae6bb087ddf85cf85dce43eb@collabora.co.uk>
[switch to g_hash_table_contains as per xclaesse's review -smcv]
Signed-off-by: Simon McVittie <2b470b34502dbf3ba4bcc04ea7e64f4e0e104f33@collabora.co.uk>

Ziemin/telepathy-gabble,Ziemin/telepathy-gabble,Ziemin/telepathy-gabble,Ziemin/telepathy-gabble