Move removal of some warnings to the OD_OPT_FLAGS variable on MinGW
Merge pull request #189 from akien-mga/development

Move removal of some warnings to the OD_OPT_FLAGS variable on MinGW
Added newes forge objects.

Removed the old forge models, texture and material files.
I also removed the old field obsolete model file.

I added corresponding credits and fixed forgotten levels there.

There are still a few issues linked to the Chimmey model, but overall it's looking awesome! :)

Fixes #187
Dropped tinyxml.

Part of #2 and #132
Fixed all the initialization reordering mistakes + a few other ones.

With this, we shouldn't need -Wno-reorder anymore.

Part of #176
Removed the -Wno-reorder flag now our code is fixed for that part.

Fixes #176
Removed references to obsolete dependencies, and especially tinyxml.

Thanks to Akien for pointing out.
Reordered CREDITS