Possibility to define the order of content and parameters in Wiki Macros

It's now possible to specify the order of the wiki macro parameters: a new property "order" is available in the WikiMacroParameterClass allowing to define the order of each parameter. This order defines how the parameters are sorted in the macro configuration UI. The lower the value for the order, the higher the priority to display them in the configuration UI. Note that it's also possible to define the order of the content, which is displayed in same UI, to order it with the other parameters. The default value is -1 and means no preset order.