Support camt.053

[andrewshadura]

Bank statements in camt.053 share some parts of the structure, so probably should be relatively easy to add support.

For your reference, a simple parser implementation can be found in https://github.com/tkarabela/okane

[raphaelm]

I don't think this library can be easily transformed from "generating" to "parsing" without a more or less full rewrite

[andrewshadura]

Right. I didn't realise it was only generating XML files. In fact, for my usecase just generating would be enough, as I need to convert a CSV statement into a SEPA XML.

[raphaelm]

I don't personally plan on adding that, since I have no use for it, but I'd consider a well-tested PR for it