Fixed issue with changed function signature.

Updated version to 1.2

Fixed call to DidX to match new function signature.

Fixed ChangeTemperature to match new function signature
Added gas generation icon for mutation

Added manifest.json

Level of explosions now calculated separately from burning gas. No more massive temperature increases across large areas at base explosion density.

Level of explosions now calculated separately from burning gas. No more massive temperature increases across large areas at base explosion density.

Updated encounter and population tables so that the new grenade type may actually be found in the game world.

Temperature change from explosion effect now respects phase of parent object.