shadowsocks-libev: rewrite

- 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>

net/shadowsocks-libev/files/shadowsocks-libev.config

@@ -1,15 +1,60 @@
-
-config shadowsocks-libev
-	option enable '1'
-	option server '127.0.0.1'
-	option server_port '8388'
+config ss_local
+	option disabled 1
+	option server 'sss0'
+	option local_address '0.0.0.0'
 	option local_port '1080'
-	option password 'barfoo!'
+	option timeout '30'
+
+config ss_tunnel
+	option disabled 1
+	option server 'sss0'
+	option local_address '0.0.0.0'
+	option local_port '1090'
+	option tunnel_address 'example.com:80'
+	option mode 'tcp_and_udp'
 	option timeout '60'
-	option encrypt_method 'rc4-md5'
-	option ignore_list '/dev/null'
-	option udp_mode '0'
-	option tunnel_enable '1'
-	option tunnel_port '5300'
-	option tunnel_forward '8.8.4.4:53'
-	option lan_ac_mode '0'
+
+config ss_redir hi
+	option disabled 1
+	option server 'sss0'
+	option local_address '0.0.0.0'
+	option local_port '1100'
+	option mode 'tcp_and_udp'
+	option timeout '60'
+	option fast_open 1
+	option verbose 1
+	option reuse_port 1
+
+config ss_redir hj
+	option disabled 1
+	option server 'sss0'
+	option local_address '0.0.0.0'
+	option local_port '1100'
+	option mode 'tcp_and_udp'
+	option timeout '60'
+	option fast_open 1
+	option verbose 1
+	option reuse_port 1
+
+config ss_rules 'ss_rules'
+	option disabled 1
+	option redir_tcp 'hi'
+	option redir_udp 'hi'
+	option src_default 'bypass'
+	option local_default 'checkdst'
+	list src_ips_forward '192.168.1.4'
+	list dst_ips_forward '8.8.8.8'
+
+config server 'sss0'
+	option disabled 1
+	option server '192.168.1.3'
+	option server_port '9001'
+	option password '********'
+	option method 'aes-256-cfb'
+
+config ss_server
+	option disabled 1
+	option server_port '9001'
+	option password '********'
+	option method 'aes-256-cfb'
+	option bind_address '192.168.7.72'