Dump: Improve Dumping

[DavidRaab]

Dumping values with ->dump and ->dumpw works fine for most cases but has some problems.

• Code is not the best, it just creates a string with string manipulation. Maybe not the best way to create dumps but works at the moment and it is not a lot of code for what it does.
• Add the ability to add dumping to other values. This is already partialy solved as I now use an internal dispatch table that can be easily extended for every new type.
• Write documentation.
• No Configuration besides the inlining stuff.
• Strings are not correctly dumped at all. This is because i use string manipulation for creating the dump. A string containing whitespace is not correctly dumped at all. But it's okay. Dumping is for debugging not for creating serialized data.
• No cyclic reference detection at all. Also okay at the moment. Just don't build such data-structures!