Improve tag replacement

[CePeU]

Selection of tags works nicely. Now improve on tag replacement:

One Option
div.testclass ==> div.newclass (would replace also the class inside to newclass)

Probably Better Option:
Define "functions" or keywords

• replaceTagAddClasses(p,newclass1,newclass2)
• replaceTagAddAttribute(p,newAttribute1,newAtribute2) //or directly in Array form? [newAttripute1,newAttribut2]
• replaceClass(oldclass,newclass)
• replaceAttribute(oldAttribute,newAttribute)
• addAttribute(newAttribute)
• addClass(newClass)

With this change the foundryID generation might be exposed also - this is probably easier for users than using the javascript?

• addAttribute(secret="${foundryID}")