PIA and Windscribe hardcoded IP addresses

- Allows to not need to resolve subdomains at start before tunneling
- Allows for Unbound to be configured and started after tunneling
- Refers to #127

internal/models/pia.go

@@ -0,0 +1,8 @@
+package models
+
+import "net"
+
+type PIAServer struct {
+	IPs    []net.IP
+	Region PIARegion
+}