read WorkingDirectory from Apple's Info.plist and set Java/Resource folder more programmatically

- use the folder of the App package as base directory
- set all directories based on this
- read the WorkingDirectory from Apple's Info.plist (key:
Java/WorkingDirectory)
-- interpret the 3 different values $JAVAROOT, $APP_PACKAGE, $USER_HOME
-- fallback to root / as standard
- change to the WorkingDirectory before executing the Java task
MainClassName without quotes + blank before appending arguments
version 0.4