Finalmask: Add XICMP (relies mKCP/QUIC or WireGuard) (#5633)

https://t.me/projectXtls/1473

transport/internet/finalmask/xicmp/config.go

@@ -0,0 +1,16 @@
+package xicmp
+
+import (
+	"net"
+)
+
+func (c *Config) UDP() {
+}
+
+func (c *Config) WrapPacketConnClient(raw net.PacketConn, first bool, leaveSize int32, end bool) (net.PacketConn, error) {
+	return NewConnClient(c, raw, end)
+}
+
+func (c *Config) WrapPacketConnServer(raw net.PacketConn, first bool, leaveSize int32, end bool) (net.PacketConn, error) {
+	return NewConnServer(c, raw, end)
+}