Add tags to control the models of units across various theater conditions.

[obsidian14]

I have added tags to control the vxl models of units across various conditions.
[TechnoType]->TemperateImage=;TechnoType entry
Change the unit model to specified model under temperate climate conditions.
[TechnoType]->SnowImage=;TechnoType entry
Change the unit model to specified model in snowy weather.
[TechnoType]->UrbanImage=;TechnoType entry
Change the unit model to specified model in urban environments.
[TechnoType]->DesertImage=;TechnoType entry
Change the unit model to specified model in desert environments.
[TechnoType]->NewUrbanImage=;TechnoType entry
Change the unit model to specified model in new urban environments.
[TechnoType]->LunarImage=;TechnoType entry
Change the unit model to specified model in lunar environments.

[DeathFishAtEase]

Ares already has a [TechnoType]►AlternateTheaterArt= (boolean), would it be better to use the same flag to add support for voxel technos?

---

[TechnoType]►AlternateTheaterArt= (boolean)

• Specifies whether or not this SHP-based unit can have alternate art depending on the theater of the current map. For example, setting Image=JUNK and AlternateTheaterArt=yes on a unit will make the unit load artmd.ini section [JUNKA] on arctic, [JUNKD] on desert, and so on according to theater. If any of those sections do not exist then the unit will fall back to [JUNK]. So quite similar to AlternateArcticArt, just automatic and smarter. Defaults to no.

In rulesmd.ini:

[General]
ArtImageSwap=true
[DLPH]
AlternateTheaterArt=true

In artmd.ini:

[DLPHA]:[SQD]
Image=SQD

---

In addition, we have already added these. If the custom flags for each climate are retained, how will the contents of this PR coordinate with them?

In rulesmd.ini:

[SOMEVEHICLE]                         ; VehicleType
Image.ConditionYellow=                ; VehicleType entry
Image.ConditionRed=                   ; VehicleType entry
WaterImage.ConditionYellow=           ; VehicleType entry
WaterImage.ConditionRed=              ; VehicleType entry

[github-actions]

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