v0.64.0

Rewrite Block processing - fixes bugs and up to 3x performance - sync within 12 hours on 4 cores (super node).
Rewrite connecting to mongo database - use single connection
Breaking change: utxo database now contains vout instead of voutIndex to be in alignment with insight api
/zelapps/permanentmessages call now available
/zelapps/globalspecifications call now available
/explorer/reindex/:reindexapps? has now possibility to reindex apps database - use with caution
/explorer/rescan/:blockheight?/:rescanapps? has now possibility to rescan apps database - use with caution
Better database indexes
Fixes possible unresponsivness of reindex and rescan calls
Takes chain reorganisations in consideration