Added newest forge objects, prepared by Danimal! :D

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.

The new models look 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.
Removed the -Wno-reorder flag now our code is fixed for that part.

Fixes #176
Updated the FAQ.txt documentation. Some of it was clearly outdated.

- Removed references to obsolete dependencies, and especially tinyxml.
- Fixed the documentation a bit.
+ Typo fixes base Akien's input. :)
Added a new skirmish level ;)
Merge pull request #190 from Bertram25/development

New forge objects & dropped tinyxml