Plymouth: Work in Progress (not ready to be merged)

Plymouth builds successfully (although the expression is hacky). I can run it on my main system: `plymouthd --no-daemon` stays running. I can also run plymouth-set-default-theme and `plymouth --show-splash` which dumps me on to tty1. Nothing else is displayed. I also tested it from a VM (build-vm-with-bootloader) after setting "vga=0x794" in grub2. I get the same results.