Z coin optional date

[smk762]

This PR tests the dev branch API with includes KomodoPlatform/komodo-defi-framework#1967

For syncing ARRR, the following cases apply:

• If no prior cache and use_date if off, sync starts 2 days in the past.
• If no prior cache and use_date if on, sync starts on block height derived from date (rounded to nearest 1000).
• If prior cache exists and use_date if off, sync continues from prior cache height.
• If prior cache exists and use_date if on, and date value has changed since last sync, sync starts on block height derived from date (rounded to nearest 1000).
• If prior cache exists and use_date if on, and date value has not changed since last sync, sync continues from prior cache height.

To test:

• log in and activate ARRR to cover the cases above and confirm app performs as expected.

[cipig]

this one really fixes my problem

i have this

and after restart it doesn't overwrite the existing DB any more, it continues from where it stopped

[cipig]

if i just check "use date sync" and keep the date same it starts from

21 06:09:48, coins::z_coin::z_rpc:389] INFO Older/Newer sync height detected!, rewinding walletdb to new height: Some(2490000)
21 06:10:05, coins::z_coin::z_rpc:497] INFO Older/Newer sync height detected!, rewinding blocks_db to new height: 2490000
21 06:10:12, coins::z_coin::z_rpc:882] INFO (Re)starting light_wallet_db_sync_loop for ARRR, blocks per iteration 5000, interval in ms 0

after restart, overwriting the existing DB
my DB started originally in 2021

checked all cases with "If prior cache exists", the last 3 ones... working as expected

[cipig]

all 5 cases work as expected
thanks for the fix

The merge-base changed after approval.