Add Vanilla Conquer C&C engine
Vanilla Conquer is a C&C engine which can run Tiberian Dawn and Red Alert. https://github.com/TheAssemblyArmada/Vanilla-Conquer
@gizmo98 https://github.com/Exarkuniv/RetroPie-Extra already has it. Not sure if it's something they would want to add since of how the file need to line up
WIP: https://gist.github.com/s1eve-mcdichae1/90edfe26d735a1b6e021ce523ee52e0f
I think this has improved file handling vs. the current RP-Extra module.
Installed executables are kept separate from user-provided game assets (or downloaded demo), and symlinks are used to combine them all in the install directory.
A unified launcher script allows for cleaner config dirs.
$home/.config/vanilla-conquer dir linked to $md_conf_root/vanillacc for network access and backup of savegames and configs.