changed context to opengl 4.3

.. most of the graphics started behaving strangely and not show up at
all. I'll have to figure out why this is happening
Hello world - SFML edition :space_invader:
fix for debug/gdb crash

There was a problem with sfml or glew debug symbols. Lets assume they
will never crash and we have to only care about our own code :)
hello world OpenGL 4.3 edition

Transtorm feedbacks included!
works so far.. last commit before experimenting
wrapped everything into game class
Merge pull request #2 from PawelLyskawinski/experimental_SFML_C_rewrite

Experimental sfml c rewrite