most of them were just calling the gitclone script,
so remove them.

the grub script was treating gnulib as a dependency.
i've now added the ability to grab 1 dependency, in
the gitclone script (it should be expanded later to
support multiple dependencies)

the gitclone script has been renamed to "fetch".
the "fetch_trees" script does more or less the same
thing, but calls "fetch" and handles multiple revisions
if a project needs that

this is more efficient, and slightly reduces the code
size of lbmk!

Signed-off-by: Leah Rowe <leah@libreboot.org>

move resources/scripts/download/ to:
resources/scripts/update/module/

This: ./download coreboot
Is now: ./update module coreboot

However, running "./download coreboot"
still works, via backwards compatibility.

Signed-off-by: Leah Rowe <leah@libreboot.org>