Memory tree read and write functions do not match associated memory function names

Memory tree uses read and write but memory uses read_bytes_owned and write_bytes.

We should standardize on a single API. The names read and write seem simplest. The _bytes is superfluous since the VarnodeData::size indicates how much should be read or written, and this field is in bytes.
Nearly all calls ultimately call read_bytes_owned, so it's questionable if the sister API read_bytes is necessary. The non-owned reads occur when reading values which cannot be symbolic (e.g. reading memory to load instructions). Seems a better API would be read_concrete which internally could avoid cloning the data prior to concretization.

mnemonikr / symbolic-pcode