Initial public release: FromDevice and ToDevice

The rough concept is taken from kohler/click/elements/minios, but is
then adapted to use unikraft instead of Mini-OS.

Signed-off-by: Florian Schmidt <florian.schmidt@neclab.eu>
Reviewed-by: Felipe Huici <felipe.huici@neclab.eu>

Initial public release: stubs.cc for unfinished glue implementations

Signed-off-by: Florian Schmidt <florian.schmidt@neclab.eu>
Reviewed-by: Felipe Huici <felipe.huici@neclab.eu>

Initial public release: click config-userlevel.h

We use userlevel mode for our unikraft click port. This config sets
options according to which features are available in unikraft.

Signed-off-by: Florian Schmidt <florian.schmidt@neclab.eu>
Reviewed-by: Felipe Huici <felipe.huici@neclab.eu>

Initial public release: click.cc: ifdef out xen-specific code.

In the ClickOS port, this code mostly deals with providing a console for
interacting with Click. This initial release doesn't have such support,
but this could be revisited at a later point.

Signed-off-by: Florian Schmidt <florian.schmidt@neclab.eu>
Reviewed-by: Felipe Huici <felipe.huici@neclab.eu>

Initial public release: click.cc

This is taken from from kohler/click/minios/, with an updated copyright
header.

Signed-off-by: Florian Schmidt <florian.schmidt@neclab.eu>
Reviewed-by: Felipe Huici <felipe.huici@neclab.eu>

Initial public release: basic unikraft files

Add Makefile, Makefile.uk, Config.uk, .gitignore, .md files

Signed-off-by: Felipe Huici <felipe.huici@neclab.eu>
Signed-off-by: Florian Schmidt <florian.schmidt@neclab.eu>
Reviewed-by: Simon Kuenzer <simon.kuenzer@neclab.eu>

initial commit (empty)