Vim

First pass at a vim addon for the unofficial repo. Executable builds and works, haven't worked out how to bring forward features like syntax highlighting and such. Tested against 4.1.5 beta and master, both seemed to work as expected. I gave a run at rebasing this into one commit but apparently I don't know how to do that, so it's three commits, but it's all new files so still pretty clean? I guess?

I tried, git is sorcery.
should be "4.3.0" no "1.0-7.4"
($ADDON_VERSION.$PKG_REV). ADDON_VERSION comes from config/version. ATM we build unofficial only for git master builds. so that's ADDON_VERSION=4.3