The Gangsta Wrapper

I'm making DotNet bindings for Gangsta in
ogreaddons/ogredotnet using swig. The problem is swig
does not support function parameter renaming and
"params" is a key word in C#. The only why around it
is to change the headers that it reads or copy the
class definitions in the swig files. If i copy the
class definitions to the swig files I will have to
update them everytime there is a change in Gangsta, so
I would prefer it if these change could be put in
Gangsta. please :)

This patch will change GangstaWrapper. Changing
"params" to "prmlist" in all the functions that use
"params" as a parameter name, headers and source files.