Merge branch 'master_candidate'

Merge remote-tracking branch 'LUX-Core/master'

Bump release version 5.3.1

Signed-off-by: 216k155 <216k155@luxcore.io>

Increase timeout to avoid wallet overload

Signed-off-by: tran <nguyenhoangtran11@yahoo.com>

Increase timeout to avoid wallet overload

Signed-off-by: tran <nguyenhoangtran11@yahoo.com>

Fix build macOS 10.14 Mojave

Signed-off-by: k155 <216k155@luxcore.io>

Remind user to input UTXO to avoid coin burning

Signed-off-by: tran <nguyenhoangtran11@yahoo.com>

bump to 5.2.2

darksend: faster thread exit on shutdown

Signed-off-by: 216k155 <216k155@luxcore.io>

Fixed tinyformat error