More automated interfacing of D with C codebases

[timotheecour]

Manually porting of C/C++ libraries shouldn't be the way to go (a
major problem being when said library gets updated, human errors,
porting to different architectures etc).

I've had good experience using SWIG to automate the job for me,
and used it successfully to port the following libraries to D:

* ncurses
* opencv
* sfml
to name a few.

I believe this is the way forward, as opposed to maintaining
(necessary stale) ports such as Deimos.

Swig isn't perfect however, and sometimes will bail out on
constructs such as:
C++ classes with multiple inheritance, or a few obscure C or C++
constructs. Even in that case, I find it much easier to tweak the
swig interface file to get desired output rather than undertake
the huge manual conversion task. For sfml, the interface file is
just about 40 lines for example.

Improving such kind of automated tools is where we should be
concentrating efforts, not on maintaining deimos. One such
improvement I made was to allow conversion of C++ templates to D
templates (works in large majority of cases), which makes the
library much easier to use than using name mangling schemes. More
improvements would be welcome (eg support for static library
generation as opposed to dynamic load libraries), reducing the
need for tweaking swig interface files etc.