Removing libdparse dependency from DLS

[rikki cattermole]

I and at least one other have discussed this in the past (I am one of 
the "owners" of dlang-community @rikkimax so feel free to ping).

DCD needs rewriting to use dmd-fe.

Keep or improve feature parity while stripping out how it does everything.

The other tools are in the same position, ignore DLS most IDE's don't 
use it in the D community for now and as you said it has dependencies on 
the other programs anyway.