add parsing method for Money, depending on the currency (decimal and thousand separator from currency if given)

* use also internaly always the amount() instead of amount, so the TaxedMoney are worked
* use static instead of self in MoneyClass
* change MoneyTest to use money() method, for testing TaxedMoney with the same methods

* FIX: wrong path on loading currencies.php
* add __toString, toArray, toJson methods
* add static Calling of Currency
* FIX: switch decimal/thousand for EUR