jax imports in top __init__ break casadi_tools

Currently Dingyuan must branch and comment out the init because that gets automatically imported when he imports anything from casadi_tools.

• either split the repos (what do with solvers?) or push init.py down to jax_tools.
• correspondingly update the active child repos
  • action_planner
  • encoder_dynamics,
  • hri_mpc,
  • ros_energymonitor