moved library functions to lib/ to unclutter the root directory
fix dl_runc
add basic README info
refactored help system to use dl_cmd instead of first-line comment
change all dl_ prefixes to _dl_ for consistency
remove "internal" command (not needed anymore)
fix a couple of of minor bugs in main lib
fix _dl_resolve exact match mode
move metadata functions into their own file
move all network allocation code in a single file