Heat Zones Rework

Description

Changed the way I define Heat Zones to not be overly complicated.

Check Vehicle Engines Spreadsheet for the data

Discord discussion

Current Heat Zones:

New Heat Zones:

==== Vehicle Engines ====
* Changed Engine Heat Zones to have better defined identities
** Standard Engine: Low, Medium and High Heat Zones are equal, and critical is small
** 3 Phase: Smaller High Heat Zone, and Smaller Critical Heat Zone
** Fission: Larger High Heat Zone, and Larger Critical Heat Zone
** Bio Diesel: Larger Medium Heat Zone
** Adv. Coolant: Much Larger Low Heat Zone, Much Smaller High Heat Zone, and Much Smaller Critical Heat Zone
** Gas Turbine: Larger Low Heat Zone, and Smaller Medium Heat Zone

(post the new heat zone chart with the above changelog)