Add RDI submodule, port Kitrap0d

This commit is the first in a series that will move all the exploits that use RDI
over to the R7 fork. The RDI source will be in a single known location and each
exploit will have to work from that location.

The kitrap0d exploit has been migrated over to use this submodule so that there's
one example of how it's done for future contributions to follow.
Fix metsrv.dll name issue

As mentioned here https://community.rapid7.com/thread/3788 the metsvc
script was still looking for the old file name for metsrv.dll, which
was causing the script to fail.

This commit fixes this issue. A hash is used to indicate local and remote
file names so that the remote can continue to use metsrv.dll, but it
is correctly located on disk locally.
Add module for ZDI-13-270
Fix title
Change description a bit

Try to make this sound smoother
Land #2708 - ABB MicroSCADA wserver.exe Remote Code Execution
Land #2698 Reflective DLL Submodule

Adds a Reflective DLL submodule in external pointing at the Rapid7 fork

Updates kitrap0d to use above submodule

Adds a make.bat file to create kitrap0d
Land #2707 - Fix metsrv.dll name issue in metsvc script

[FixRM #8707]