Nyzo 627: Nyzo string balance search

Nyzo version 627 (commit on GitHub) adds the option of using a Nyzo string in the client balance search.

This version affects the client.

In BalanceDisplayCommand, the maximumAccountsInResponse constant was added to define a limit on response size.

The rawIdOrPrefix and nyzoStringIdOrPrefix variables were added to store normalized search prefixes for the two forms of search now permitted.

Search strings that begin with the id__ prefix set the search to Nyzo-string mode. Search strings that do not begin with this prefix set the search to raw mode, which is the previous behavior.

A notice is added to show the string used for the search, and another notice is added to show the type of search.

The search looks for matches on either Nyzo string representation or raw (hex) representation of all account identifiers in the balance list. The result size limit is imposed, and a notice is added if the number of search results is equal to this limit.

The following demonstrates this new search option on the Nyzo client: https://client.nyzo.co/balance?walletId=id__8cd&action=run.