Parsing of layer effects

Hi Mike! I'm implementing a parsing of layer effects. Half of work is done by now (namely, 'lrFX' tagged block is parsed) and I would like you to pull this stuff. The part 2 is coming soon.
Here and further were actually a big problems, causing the decoder of descriptor and it's items not to work properly...
[Your Copy-Paste could be someone else's nightmare... :smiling_imp:  (not actually yours AFAIK)]