[Fluxus] glsl shader and -x option

[gabor papp]

hi Krisztian,

thanks for the report. the reason of the bug is that load happens before 
glsl init. glsl init is done in the prerender stage, and when you load a 
script with -x, it happens before that.

i believe the solution would be to write a libfluxus initializer that 
does all the opengl initializations before anything happens. this would 
be handy for lots of other things like detecting the supported opengl 
capabilities like fbo, multitexturing, texture compression etc. now 
these things are hacked into the classes. what do you think about this, 
Dave?

best,
gabor