API: libcrmcommon: deprecate crm_str_table_new()
Pacemaker's public API should be Pacemaker-specific, and not provide
glib convenience wrappers.
Internal uses are replaced with a new internal function, pcmk__strkey_table(),
with slightly different semantics. Calls to crm_str_table_new() become:
pcmk__strkey_table(free, free)
and g_hash_table_new_full(crm_str_hash, g_str_equal, FN1, FN2) becomes:
pcmk__strkey_table(FN1, FN2)