Replace wget with curl -fsSL, normalize downloads, and prep for IPv6 (#3455)

* Initial Call, Switch from curl -s to curl -fsSL and wget to curl -fssL

* more switches

* switch vms

* more curls

* More curls

* more

* more

* more changes

* more

* prepare ipv6 calls

* change frontend to ipv6

* Formatting

* Fromatting

* Update gomft.sh

* Update gomft-install.sh

* Update ersatztv.sh

* Update build.func

---------

Co-authored-by: Slaviša Arežina <58952836+tremor021@users.noreply.github.com>

misc/post-pmg-install.sh

@@ -172,7 +172,10 @@ while true; do
   read -p "Start the Proxmox Mail Gateway Post Install Script (y/n)?" yn
   case $yn in
   [Yy]*) break ;;
-  [Nn]*) clear; exit ;;
+  [Nn]*)
+    clear
+    exit
+    ;;
   *) echo "Please answer yes or no." ;;
   esac
 done