ipk-source: Add luci-app-tailscale; rename directories

- Added luci-app-tailcale to ipk-source from: https://github.com/asvow/luci-app-tailscale/releases/tag/v1.2.3

- Renamed ipk-source directories to have no version number, only arch where needed.

ipk-source/luci-app-tailscale/data/etc/hotplug.d/iface/40-tailscale

@@ -0,0 +1,8 @@
+#!/bin/sh
+
+tailscale_enable="$(uci get tailscale.settings.enabled)"
+
+[ "$ACTION" = ifup -o "$ACTION" = ifupdate ] || exit 0
+[ "$ACTION" = ifupdate -a -z "$IFUPDATE_ADDRESSES" -a -z "$IFUPDATE_DATA" ] && exit 0
+[ "$tailscale_enable" -eq "1" ] || exit 0
+/etc/init.d/tailscale start > /tmp/tailscale.log 2>&1 &