Changed the OSX app bundle and Mac DMG file to be BitcoinABC-Qt.app and
Bitcoin-ABC.dmg respectively (old one was Core's Bitcoin-Qt.app and
Bitcoin.dmg)
Note this is a cosmetic change only and is verified to not break
settings which are still saved in
~/Library/Preferences/org.bitcoin.Bitcoin-Qt
I will write another PR.. err.. diff.. that will update the Qt App Name
and Org Name to be Bitcoin ABC -- and I will also write transition
"migration" code that will copy settings from old core
settings/registry/etc (cross platform location in this case) to our own
BitcoinABC location.