Windows build works again

Mostly updated sdl2 and glew to latest versions
glew 1.9 and sdl dated today.
Small changes for VBO since visual studio is bad with certain style
initializer lists. VBO overhaul is on it's way.
Readme up-to-date.
Update README.md

Learning markdown, somehow can't get newlines to work.
mainly rubbing stuff in visualstudio

changed .gitignore to ignore more stuff
applied visualstudio fixes