Stubbed UdpSocket struct, added Socket structs

src/socket/mod.rs

@@ -0,0 +1,39 @@
+pub trait Socket {}
+
+pub type OwnedSockets = (
+    Socket0,
+    Socket1,
+    Socket2,
+    Socket3,
+    Socket4,
+    Socket5,
+    Socket6,
+    Socket7,
+);
+pub type Sockets<'a> = (
+    &'a mut Socket0,
+    &'a mut Socket1,
+    &'a mut Socket2,
+    &'a mut Socket3,
+    &'a mut Socket4,
+    &'a mut Socket5,
+    &'a mut Socket6,
+    &'a mut Socket7,
+);
+
+pub struct Socket0 {}
+impl Socket for Socket0 {}
+pub struct Socket1 {}
+impl Socket for Socket1 {}
+pub struct Socket2 {}
+impl Socket for Socket2 {}
+pub struct Socket3 {}
+impl Socket for Socket3 {}
+pub struct Socket4 {}
+impl Socket for Socket4 {}
+pub struct Socket5 {}
+impl Socket for Socket5 {}
+pub struct Socket6 {}
+impl Socket for Socket6 {}
+pub struct Socket7 {}
+impl Socket for Socket7 {}