Separating material colour by phase, removing ice material.

[MistakeNot4892]

Description of changes

• Material color is now solid_color, gas_color and liquid_color, autoset similarly to how solid/gas/liquid names are already handled.
• Ice (the material) has been replaced with water in solid phase where appropriate.
• Chemical reactions can now have required_reagent_phases defined where reagents must be in a certain phase to count as a correct input.

Why and what will this PR improve

Having ice and water as different materials has always been a bit weird. This will at clean that up and allow for a more cohesive sim.

TODO

• Break giant commit up into reaction changes, material colour changes, other changes.
• Test general materials (furniture, items, etc)
• Test borg hypos
• Test snowmen
• Test ice turfs
• Test chemistry reactions

Authorship

Myself.

Changelog

Hopefully nothing player-facing.