Wrapper class for resource bundles. Property files are used to store resource strings, which are the only types of resources available. Property files can inherit properties from other files so that a base property file can be used and a small number of properties can be over-ridden by another property file. For example you may create an english version of a resource file named "resource.properties". You then decide that the British English version of all of the properties except one are the same, so there is no need to redefine all of the properties in "resource_en_GB", just the one that is different.
The basename is the name of the property file without the ".properties" extension.
Properties will be cached for performance.
Property values stored in the property files can also contain dynamic variables. Any dynamic variable defined in PropertiesUtil.getVariableValue() can be used (such as {date}), as well as arguments in the form {0}, {1}, etc. Argument values are specified in the various overloaded getString() methods.