OWallet v0.9.28

1. Add a prompt message for quit the node
2. fix some bugs

File hashes
File: OWallet-0.9.28-Mac-Setup.dmg
SHA256:93a6b668292a0b62043d6b28d72314501cc5bbaacc0d6deb3493ccbea5c756d6
File: OWallet-0.9.28-Linux-Setup.AppImage
SHA256:bcd45daa657d7e5361e5080a83166db51e490a9c760bd3d862cce192bdf04a5b
File: OWallet-0.9.28-Windows-Setup.exe
SHA256:51d840bfa7ef5152765258dc77ebf48519bebcdb97cdbe68751032e12bbd4e7d