Add damage inflicting functions

[vurvdev]

• Add WireLib.CanDamage which uses CPPICanDamage or PlayerShouldTakeDamage if CPPI is absent.
• Enables the damage extension by default (only allows getter functions and the event by default)
• Add blastDamage(vnn), e:takeDamage(n), e:takeDamage(ne), e:takeDamage(nee), all disabled by default with wire_expression2_damage_enabled convar.
• Add wire_expression2_damage_maxradius to control max blastDamage radius, default 2000.
• Mark existing damage getter methods as nodiscard

Currently haven't implemented the equivalent of https://wiki.facepunch.com/gmod/Entity:TakeDamageInfo, mostly because apparently CTakeDamageInfo objects are shared, so I'd need to write a table wrapper in between E2 and GLua, and it just isn't worth it for the small extra functionality it would add, at least for now.

RFC:

• Different convar names?
• Should default max radius be adjusted?

[thegrb93]

Helper update needed I think

[vurvdev]

Think this is fine?

--- Returns if given player can damage the given entity.
---@param player Player
---@param target Entity
function WireLib.CanDamage(player, target) ---@return boolean
	if target:IsPlayer() then
		return hook.Run("PlayerShouldTakeDamage", target, player)
	else
		return WireLib.CanTool(player, target, "")
	end
end

I'd go with just CanTool but seems pretty restrictive. Won't even be able to target yourself unless there's an edge case I put for it.

And I think any server that cares about being restrictive about this either will have an addon that defines CPPICanDamage, or just won't set wire_expression2_damage_enabled to 1.

[thegrb93]

That probably works, ya