Main change here is in Installer.java where scanDirectory was changed to work recursively, thanks to this we are able to find JVM on macOS which are in less predicable places ;-) on macOS JVM location will be for example /Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home, but scaning /Library/Java/JavaVirtualMachines/ without this recursive thing will not find JVM.

Additionally changed text in MainWindow which suggests now that users should prefer alternate JVM over replace JVM, with short "explanation" why.

In case of some custom installation, e.g. i have special dcevm-enabled jre at `/opt/oracle-jre-bin-1.8.0.45-dcevm/`