Try to factorize using tuple
Use variadic recursion to expand tuples

It's quite non trivial to do but it should save a lot of typing later.
Factorize spheremap too.
Factorize Unlit material
Factorize detail mat too
Fix linux compilation
Factorize transparent materials too
Use const ref in recursive variadic template unroll_arg<>::exec
Factorize all first pass materials.
Enable CPP2011 on linux.
Disable WIIUSE by default on linux.
Add asserts to catch issue early
Merge branch 'master' of https://github.com/supertuxkart/stk-code
Early exit renderSkybox without skybox textures
Wrong condition used.
Merge branch 'renderFactorisation'
Remove useless RTT and simplify rendering of icons on the minimap
Merge branch 'renderFactorisation'
Fix position reconstruction formula in ssao
Use a default texture for rubber band