* basic invoiced tx working
* rustfmt
* teardown
* rustfmt
* rename, new struct for invoice args, begin to add new functions to RPC apis
* rustfmt
* add fns to rpc api
* rustfmt
* owner api functions RPC documentation in place
* rustfmt
* doctests for new invoicing functions
* rustfmt
* test fixes
* update documentation and doctests
* rustfmt
* invoice testing verification of tx log output
* rustfmt
* move api deser types into separate types mod
* rustfmt
* missing types file
* make all exports from libwallet more explicit
* rustfmt
* add version check function to foreign api
* rustfmt
* change check_version return value to result, for consistency