simpler (than OBJECT) parser for STRING parameters and properties

At the moment a general parser (which recognizes objects, lists, properties, etc) is used for properties and parameters of type STRING. The problem with this is that some characters that appear special in values of types OBJECT, PROPERTY, LIST, etc have to be escaped in values of type STRING. E.g.

--connection-url=jdbc:h2:~/unifiedpush;DB_CLOSE_DELAY=-1

Here the equals sign before -1 has to be escaped, otherwise the value will be treated as PROPERTY and the equals sign as a name/value separator.