- add: Changeling antagonist (#2)

* Changeling WIP

* UI

* Pointers fix

* Moved out abilities

* Regenerate ability

* Fixed Regenerate ability
Prevent ghosting while regenerating

* Cleanup

* Base lesser form

* Finished Lesser Form && Transform

* Transform Sting

* Blind Sting

* Mute Sting
Added OnExamine on absorbed human

* Hallucination Sting
Changeling Absorb and transfer absorbed entities to absorber

* Cryogenic Sting

* Adrenaline Sacs

* Transform now uses Polymorph

* Armblade, Shield, Armor

* Tentacle Arm ability
Tentacle Gun system

* WIP with bugs

* WiP bugs

* fix implant transfer

* Fixed bugs with shop transfer and actions transfer

* Just in case

* Vi sitter i ventrilo och spelar DotA

* Fixes and proper LesserForm tracking

* !!!!!

* Fixed empty buttons

* WIP Gamerule
Ready - shop

* nerf stun time cause its sucks

* cleaning

* just in case

* Absorb DNA Objective.

* Partial objectives with bugs

* fix

* fix pointer

* Changeling objectives

* Changeling objectives №2

* Admin verb, game rule

* Fixed empty list check
Icons for objectives

* Changeling chat, changeling names etc.

* fix some merge errors

* - fix: Fixed all bugs with changeling

---------

Co-authored-by: Y-Parvus <yevhen.parvus@gmail.com>
Co-authored-by: Y-Parvus <61109031+Y-Parvus@users.noreply.github.com>
Co-authored-by: HitPanda <104197232+EnefFlow@users.noreply.github.com>
Co-authored-by: EnefFlow <regeto90@mail.ru>

Content.Server/Changeling/ChangelingSystem.Shop.cs

@@ -0,0 +1,24 @@
+using Content.Server.Store.Components;
+using Content.Server.Store.Systems;
+using Content.Shared.Changeling;
+using Content.Shared.Implants.Components;
+using Robust.Server.GameStates;
+using Robust.Server.Placement;
+
+namespace Content.Server.Changeling;
+
+public sealed partial class ChangelingSystem
+{
+    private void InitializeShop()
+    {
+        SubscribeLocalEvent<SubdermalImplantComponent,  ChangelingShopActionEvent>(OnShop);
+    }
+
+    private void OnShop(EntityUid uid, SubdermalImplantComponent component, ChangelingShopActionEvent args)
+    {
+        if(!TryComp<StoreComponent>(uid, out var store))
+            return;
+
+        _storeSystem.ToggleUi(args.Performer, uid, store);
+    }
+}