pre-shared key option

• adds pre-shared key support to help quantum secrecy

• based on this original PR

  • k4yt3x#11

• with proposed changes for 2.5.2 in:

  • k4yt3x#35

• with this version wg-meshconf genconfig will add pre-shared keys to the configuration output

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To test either download these archives or clone my repo version - & create an isolated app:

git clone https://github.com/itoffshore/wg-meshconf.git
cd wg-meshconf
pipx install .

ensure you have ~/.local/bin/ added to your $PATH