Remove obsolete ciphers

mobile/src/main/res/values/arrays.xml

@@ -1,8 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
     <string-array name="enc_method_entry">
-        <item>TABLE</item>
-        <item>RC4</item>
         <item>RC4-MD5</item>
         <item>AES-128-CFB</item>
         <item>AES-192-CFB</item>
@@ -23,8 +21,6 @@
     </string-array>
 
     <string-array name="enc_method_value">
-        <item>table</item>
-        <item>rc4</item>
         <item>rc4-md5</item>
         <item>aes-128-cfb</item>
         <item>aes-192-cfb</item>

mobile/src/main/res/values/strings.xml

@@ -60,7 +60,6 @@
   <string name="forward_success">Shadowsocks started.</string>
   <string name="invalid_server">Invalid server name</string>
   <string name="service_failed">Failed to connect the remote server</string>
-  <string name="method_unsafe">WARNING: The current encryption method is unsafe</string>
   <string name="nat_deprecated">WARNING: NAT mode has been deprecated since Android 5.0</string>
   <string name="nat_no_root">NAT mode requires ROOT permission</string>
   <string name="switch_to_vpn">Switch to VPN mode</string>

mobile/src/main/scala/com/github/shadowsocks/BaseService.scala

@@ -183,9 +183,6 @@ trait BaseService extends Service {
 
     changeState(State.CONNECTING)
 
-    if (profile.isMethodUnsafe)
-      handler.post(() => Toast.makeText(this, R.string.method_unsafe, Toast.LENGTH_LONG).show())
-
     Utils.ThrowableFuture(try connect() catch {
       case _: NameNotResolvedException => stopRunner(stopService = true, getString(R.string.invalid_server))
       case _: NullConnectionException => stopRunner(stopService = true, getString(R.string.reboot_required))