add a -pakpath equivalent

[mjstahlberg]

When I run urcheon from within map-parpax_src.dpkdir (with PATH="$PATH:/opt/netradiant" urcheon build to work around #28), then q3map2 does not locate any of the shared texture packages:

--- InitPaths ---
VFS Init: /home/eris/src/map-parpax_src.dpkdir

--- BSP ---

The map then looks like this:

Note that the only light comes from shaders that are inside map-parpax_src.dpkdir, as all other light shaders could not be loaded. The weird tiling is a result of q3map2 not finding the texture files.

How do I make Urcheon pass additional paths to q3map2?

[illwieckz]

export PAKPATH="/some/path/UnvanquishedAssets/src:/some/other/path/src:/somewhere/else/src"
urcheon build

[mjstahlberg]

Thanks! You want to keep this issue open for a potential -pakpath command line argument?

[illwieckz]

good idea, rewriting the topic