Adds a simple file to create a work tree with only what's needed to RUN the
game.
.dmb/.rsc, _maps, strings, and some icons and sounds.
Makes the Dockerfile use it.
Also adds dependencies.sh which can serve as a single version source used by
all CI and utils.
Enables appveyor and artifacts, you can now download a .dmb deployment straight
from a PR or master commit.
Tools (tgui and changelog) are split out into their own build and are not
installed/built in the standard per map build, this should give developers
better visibility on if it's a tool breakage, or their code is faulty
This also moves most of the travis related scripts into a single folder
this is entirely for sanity reasons, they've also all be made user
executeable