Ubuntu 24 Installer rewrite

`setup.sh` and `start.sh` combined into a single script
netalertx now starts and runs via systemd unit, can be started, stopped and restarted
`systemctl start netalertx`
`systemctl stop netalertx`
`systemctl status netalertx`
etc
Logs to `journalctl` and output can be followed with `journalctl -f`

Amalgamated chmods
tuned chmods based on earlier feedback and discussion

install script accepts command line parameter:
- 'install' to continue and DELETE ALL!
- 'update' to just update from GIT (keeps your db and settings)
- 'start' to do nothing, leave install as-is (just run the start script, set up services etc)

Please have a look, comments welcome :-)

install/ubuntu24/requirements.txt

@@ -0,0 +1,25 @@
+openwrt-luci-rpc
+asusrouter
+aiohttp
+graphene
+flask
+flask-cors
+unifi-sm-api
+tplink-omada-client
+wakeonlan
+pycryptodome
+requests
+paho-mqtt
+scapy
+cron-converter
+pytz
+json2table
+dhcp-leases
+pyunifi
+speedtest-cli
+chardet
+python-nmap
+dnspython
+librouteros
+yattag
+git+https://github.com/foreign-sub/aiofreepybox.git