Use car distance units & remove solar type from model

[shred86]

Fixes #284

Changes

• Checking the vehicles gui_distance_units to determine whether to display miles vs kilometers instead of the user's Unit System setting in Home Assistant.
• Remove solar_type from model. The Tesla API recently changed where solar_type is no longer included in the PRODUCT_LIST endpoint.

[alandtse]

Ugh, just saw this with the nonstandard commits. I'll revert and fix.

[jaymunro]

solar_type is still present, but it is not at the top level, but under components. See my comment in #354 of teslajsonpy.

Hence shouldn't the change be the following?

-        model = f"{self._energysite.resource_type.title()} {self._energysite.solar_type.replace('_', ' ')}"
+        model = f"{self._energysite.resource_type.title()} {self._energysite.components.solar_type.replace('_', ' ')}""

I realise this has already been merged but I have never done a PR and don't know if I have the perms to start one.