Feature & Maintenance PR

[citizenkepler]

Features Added

• Added basic dependency for host tools - From a fresh MacOS install I think only VirtualBox and GPG(via homebrew) need to be installed.
• Added undocumented debug feature - Debug output can be enabled with --debug on, edebug command added to elib.sh
• Added Feature to Keep Persistent ISO Downloads - When downloading with the option --keep-downloads on, downloaded files in /tmp will be left so they can be used for the next run.
• Added support for cronie and sysklogd - Added the ability to install cronie and sysklogd, both disabled by default

Fixes

• Gentoo LiveCD now uses grub instead of syslinux - Due to this, passing the vga option caused grub to hang. Commenting that out for now works. However, the sleep to attempt ssh may need to be extended due to the added grub delay.
• Removed initial workaround to get a stage to download - I had added a workaround to get a stage to download when first updating the script. However, I found what I did not see before and can remove this workaround.

[sormy]

Thanks, great work. I have a few minor comments.