version 1.2.1->1.2.2
delay sync progress view
use secure char sequence for decrypted private keys
wipe byte[] and BigInteger
clearPrivateKey
add getLimitBlocks
upgrade
remove wipeBiginteger
QRQuality
272->216
peer connection timeout 5->7
judge null point
Merge branch 'master' into release/v1.2.2
Merge branch 'master' into release/v1.2.2
Merge branch 'release/v1.2.2'