0.3.0 - Generic fires overhaul, xenominedes fusion

This is a breaking change. If you were using fire_energy_released before, you must switch to enthalpy, which acts differently and somewhat subtly; basically, if you want a product to generate heat, give it negative enthalpy, and if you want a reactant burning to generate heat, give it positive enthalpy.

What's Changed

• Generic fires rework by @Putnam3145 in #30
• Ports xenomedes' fusion rework by @jupyterkat in #26

Full Changelog: v0.2.11...v0.3.0