* Populate r_io_lseek -> r_io_seek refactoring
* R_APIfy a bit the r_hash
* Also build hash/t/hello program
* Fix some warnings and build blockers
* Make rahash2 read from files (using slurp)
* Added r_buf API in r_util (interacts with r_io)
* Add initial template for r_io_bind
- Needs some more work