Major refactor to include tactical combat feed

Data/Scripts/Miscellaneous/GameManager/Constants.lua

@@ -1,4 +1,22 @@
 require("GameManager/FactionStruct")
+require("GameManager/GUIManager")
+require("GameManager/TutorialTextManager")
+
+-- ==================================================
+-- Define Manager constants
+-- ==================================================
+
+---The singleton GUI Manager.
+---@type GUIManager
+GUIManager = GUIManager:New()
+
+---The singleton Tutorial Text Manager.
+---@type TutorialTextManager
+TextManager = TutorialTextManager:New()
+
+---The local player.
+---@type PlayerObject|nil
+LocalPlayer = nil
 
 -- ==================================================
 -- Define Faction constants