Fix name of glew library
Move simulate to new directory and refactor to use C++ conventions
Wrap simulate in mujoco namespace
fix namespaces, convert struct to class, use std::lock_guard
use GetMutex to better handle destruction ordering
rename mjSimulate to Simulate
nit: space before public and typo
move startup print
use nullptr instead of NULL
use GetInstance() to get simulate object
convert init to default constructor