Added spawn conditions to the Hero faction

I didn't make Gnome have spawn conditions on purpose, and I tried to follow the logic in spawn conditions so that:
Dwarf1 and Adventurer creatures come early but with spawn conditions.
Dwarf1, 2 and 3 make having a forge something more important for heroes.
Knights and Wizard dislike Dwarf3 creatures so you can either choose to first build a forge and get plenty of dwarves, or a library and try to get Wizards and (Big)Knights.

Part of #313
Disable the RTSS appliance of a normal to the dormitory texture.

+ Removed a statement concerning an obsolete model/material.

Fixes #334
Removed several obsolete models, material files and textures.

Thanks to Danimal for pointing out.

End of, and fixes #318
Moved the update logic from frameStarted() frameRenderingQueued() to earn performance.

On Linux, I don't have much increase (maybe 1-2 FPS) so I can't tell more.
According to the docs, it can't hurt though:
http://www.ogre3d.org/tikiwiki/Basic+Tutorial+4

As discussed in #311
Added a quick-help window in the game mode.

Fixes #283
Added new portal model.

I also fixed Scream in the Dark for the portal positions.
The other maps weren't concerned AFAICT.

Part of #323 for 0.4.9
Updated the gitigonre file to ignore .a objects (for libangelscript.a) and remove obsolete ignored files.
Merge pull request #340 from Bertram25/development

Several stuff toward the 0.4.9 release