- New UCI options ifnames, dst_default
 - UCI options src_ips_xxx now accept cidr as their values
 - Export ipset names as part of the interface so that it can be
   depended on and used by other programs
 - Bypass only remote servers used ss-redir instances, so that it's
   possible to let other servers to go through existing re-redir
   instances

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>

- Selecting only a single or subset of all components of shadowsocks-libev is
  now possible (this is the main motivation behind the rewrite)
- Configuring multiple instances of the same component is now also possible
- Same option names as with the json config
- Unified configuration generation method for each component
- Add support for ss-local, ss-tunnel, ss-server
- Most data validation is now done with validate_data
- USE_PROCD=1
- Update ss-rules with the one from shadowsocks/luci-app-shadowsocks
- Add README.md
- Set myself as the maintainer

Addresses #4435

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>