[Makefile] Run development server in source tree
[Makefile] Run development server in source tree

Allows it to load the client files from disk instead of the server archive,
thus enabling the developer to change them without restarting the server,
allowing for quicker cycles.

CylonicRaider/Instant,CylonicRaider/Instant,CylonicRaider/Instant,CylonicRaider/Instant,CylonicRaider/Instant