so that we can easily generate correctly formatted serialized versions

added vehicles for thermal calibration
various other changes

`from_msg_pack` is complaining about getting a string:
`OSError: invalid type: string "\"[]\"", expected a sequence`

running `python/fastsim/demos/demo_hev.py` and then
```python
import msgpack
fsim.SimDrive.from_msg_pack(msgpack.packb(msgpack.loads(sd.to_msg_pack())))
```
which yields:
```

---------------------------------------------------------------------------
OSError                                   Traceback (most recent call last)
Cell In[8], line 1
----> 1 fsim.SimDrive.from_msg_pack(msgpack.packb(msgpack.loads(sd.to_msg_pack())))

OSError: invalid type: string "\"[]\"", expected a sequence
```

shows that message pack is 2.5 orders of magnitude faster than yaml!

…ipt/test mode but is hit or miss interactive mode

Evidence that yaml and msg_pack produce darn near the same result on
linux machine:
```
in [4]: import deepdiff

in [5]: deepdiff.deepdiff?

in [6]: deepdiff.deepdiff(sd_dict_msg, sd_dict_yaml)
out[6]:
{'type_changes': {"root['sim_params.ach_speed_tol']": {'old_type': float,
   'new_type': str,
   'old_value': 1e-09,
   'new_value': '1e-9'}}}

in [7]: sd_dict_msg['veh.chassis.wheel_base_meters'] == sd_dict_yaml['veh.chassis.wheel_base_meters']
out[7]: true

in [8]: sd_dict_msg['veh.chassis.wheel_base_meters']
out[8]: 2.7
```
only the one thing changed, and it's not problematic

1 failing test needs to be fixed

This reverts commit 2d42038.