Feature/scenery targets (#60)

* Added Scenery targets
* Documentation updates

classes/stageClasses/Groups/SpearheadSceneryObject.lua

@@ -0,0 +1,77 @@
+---@class SpearheadSceneryObject
+---@field private persistentName string The persistent name of the scenery object
+---@field private objectID number The ID of the scenery object
+---@field private internalObj table
+---@field private isDead boolean Indicates if the scenery object is dead
+local SpearheadSceneryObject = {}
+SpearheadSceneryObject.__index = SpearheadSceneryObject
+
+---comment
+---@param objectID number
+---@return SpearheadSceneryObject?
+function SpearheadSceneryObject.New(objectID)
+
+    local self = setmetatable({}, SpearheadSceneryObject)
+
+    if objectID == nil then
+        return nil
+    end
+
+    self.persistentName = "SpearheadSceneryObject_" .. objectID
+    self.objectID = objectID
+    self.isDead = false
+    self.internalObj = {
+        ["id_"] = objectID
+    }
+
+    return self
+end
+
+---@return boolean
+function SpearheadSceneryObject:IsAlive()
+
+    if Object.isExist(self.internalObj) == false then
+        self:MarkDead()
+        return false
+    end
+
+    if SceneryObject.getLife(self.internalObj) <= 0.10 then
+        self:MarkDead()
+        return false
+    end
+
+    return true
+end
+
+---@private
+function SpearheadSceneryObject:MarkDead()
+    if self.isDead == true then return end
+    self.isDead = true
+    Spearhead.classes.persistence.Persistence.UnitKilled(self.persistentName, self:GetPoint(), 0, "Scenery")
+end
+
+function SpearheadSceneryObject:UpdateStatePersistently()
+    if self.isDead == true then
+        return
+    end
+
+    local state = Spearhead.classes.persistence.Persistence.UnitState(self.persistentName)
+    if state and state.isDead == true then
+        trigger.action.explosion(self:GetPoint(), 1000)
+        self.isDead = true
+    end
+end
+
+
+function SpearheadSceneryObject:GetPersistentName()
+    return self.persistentName
+end
+
+function SpearheadSceneryObject:GetPoint()
+    return Object.getPoint(self.internalObj)
+end
+
+if not Spearhead.classes then Spearhead.classes = {} end
+if not Spearhead.classes.stageClasses then Spearhead.classes.stageClasses = {} end
+if not Spearhead.classes.stageClasses.Groups then Spearhead.classes.stageClasses.Groups = {} end
+Spearhead.classes.stageClasses.Groups.SpearheadSceneryObject = SpearheadSceneryObject