add luks and lvm install option

[pfpulux]

trafficstars

[Vaelatern]

No objection.

[illfygli]

I want to try Void as soon as this is released. :)

[Vaelatern]

You know you can do this during the install if you want to do it manually, but this is still a useful aid.

[abenson]

I want to try Void as soon as this is released. :)

Here is a walkthrough https://docs.voidlinux.org/installation/guides/fde.html

[spikecodes]

This would be a great addition to the installer, thanks!

[tommasoxd]

Really useful, I want to see it in the installer!

[JamiKettunen]

@pfpulux Would you mind rebasing and resolving the conflict? Not sure what's up with those include upstream fix and include upstream changes, please use git rebase if they're just to make your branch match the state of https://github.com/void-linux/void-mklive/commits/master.