Begin r_io review. Fix r_socket_http query for xpcshell's httpd.js

- Added libr/io/README in order to documentate the api
- Some minor refactoring and code cleanup in libr/io
- Fix hexdump title
Minor code cleanup in io
Initial import of libr_tcc (make -C shlr tcc-sync)
More work to deprecate old cparse and use libr_tcc
Fix build
Fix symstall for shlr/tcc
Use git describe --tags in version info
Add initial Haiku support
Better r_str_hash(), Fixes in CCa, Added ?h, Better rbin for BEOS bins

Identify Haiku binaries as 'beos' with noodle()
Fix CCa for non numeric offsets
Use sdb's r_str_hash() instead of old one (much less collisions)
Added ?h command to hash strings
CCa now appends instead of replacing comments
Do not mark as static if bin links to libs
Added sys/lua.sh to build the lua bindings easily
Add doc/haiku, r2 -V = -v, fixes for emscripten build