Add simple templates for filesystem standards functions.
Use fs.h in script/fs system.
Add function 'spm_fs_get_home()' for retrieving the user HOME directory,
usually found in the HOME environment variable.
Merge branch 'feature/filesystem' into develop
Add DHT to Sourcefile as dependency
Initiate work on DHT feature for the networking, to allow fetching
repositories and other data over BitTorrent DHT networks.
Add Tupfile for building the network parts.
Add DHT library to main Tuprules linker line.