#33 Add a new option to choose the JRE PlantUML Dependency is using, instead of using reflection

[Benjamin Croizet]

Instead of using java.lang.Class.forName to determine the type of an extensions or an implementations which is not declared in the imports and will not be parsed by the program, it may be better to maintain a list of java.lang methods per JRE and add a new option to choose which JRE PlantUML Dependency is using.