* Reimplement r_buf_fread/fwrite
* Add slice buffer and introduce readonly field
* Do nothing if size is 0
* Prevents an overflow when 8 is subtracted from size.
* Fix ragg2 when patching outside currently existing buffer
* Implement r_mem_mmap_resize for systems where mremap is not defined
* r_buf_buffer can be called with no size arg as well
* Use size_t instead of ut64
* Use r_buf_size to get the size of a buffer, not the private field
* Use r_buf_seek instead of adjusting the private cur RBuffer field
* use r_buf_read instead of r_buf_read_at(.., cur, ..)
* other r_buf_read_at/r_buf_read
* Fix RBuffer usage in REgg
* Wrong replace with r_buf_resize
* Other r_buf_resize fixes
* style fixes
* other style fixes
* Introduce r_buf_tell API instead of using seek
* other style fixes
* style
* style 2
* write_at(cur) == write
* fixes
* avoid changing test
* Make most RBuffer fields private
* Add some fixme comments
* still use base_priv in some places
* Use r_buf_size to get the size of a buffer, not the private field
* Use r_buf_seek instead of adjusting the private cur RBuffer field
* use r_buf_read instead of r_buf_read_at(.., cur, ..)
* Fix RBuffer usage in REgg
* Introduce r_buf_tell API instead of using seek
* write_at(cur) == write
