TODO add share_context

Property definitions

egl $ EGLDisplay :: create_context
	# TODO add share_context
	fun create_context(config: EGLConfig): EGLContext `{
		EGLint context_attribs[] = {EGL_CONTEXT_CLIENT_VERSION, 2, EGL_NONE, EGL_NONE}; // TODO move out!
		EGLContext context = eglCreateContext(self, config, EGL_NO_CONTEXT, context_attribs);
		return context;
	`}
lib/egl/egl.nit:126,2--131,3