- 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.Shared/Changeling/SharedChangeling.cs

@@ -0,0 +1,105 @@
+using Content.Shared.Actions;
+using Content.Shared.DoAfter;
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.Changeling;
+
+[Serializable, NetSerializable]
+public sealed partial class AbsorbDnaDoAfterEvent : SimpleDoAfterEvent
+{
+}
+
+public sealed partial class AbsorbDnaActionEvent : EntityTargetActionEvent
+{
+}
+
+
+[Serializable, NetSerializable]
+public sealed partial class TransformDoAfterEvent : SimpleDoAfterEvent
+{
+    public string SelectedDna;
+}
+
+public sealed partial class TransformActionEvent : InstantActionEvent
+{
+
+}
+
+[Serializable, NetSerializable]
+public sealed partial class RegenerateDoAfterEvent : SimpleDoAfterEvent
+{
+}
+
+public sealed partial class RegenerateActionEvent : InstantActionEvent
+{
+
+}
+
+[Serializable, NetSerializable]
+public sealed partial class LesserFormDoAfterEvent : SimpleDoAfterEvent
+{
+}
+
+public sealed partial class LesserFormActionEvent : InstantActionEvent
+{
+
+}
+
+public sealed partial class TransformStingActionEvent : EntityTargetActionEvent
+{
+
+}
+
+public sealed partial class BlindStingActionEvent : EntityTargetActionEvent
+{
+
+}
+
+public sealed partial class MuteStingActionEvent : EntityTargetActionEvent
+{
+
+}
+public sealed partial class HallucinationStingActionEvent : EntityTargetActionEvent
+{
+
+}
+
+public sealed partial class CryoStingActionEvent : EntityTargetActionEvent
+{
+
+}
+
+public sealed partial class AdrenalineSacsActionEvent : InstantActionEvent
+{
+
+}
+
+public sealed partial class FleshmendActionEvent : InstantActionEvent
+{
+
+}
+
+public sealed partial class ArmbladeActionEvent : InstantActionEvent
+{
+
+}
+
+public sealed partial class OrganicShieldActionEvent : InstantActionEvent
+{
+
+}
+
+public sealed partial class ChitinousArmorActionEvent : InstantActionEvent
+{
+
+}
+
+public sealed partial class TentacleArmActionEvent : InstantActionEvent
+{
+
+}
+
+public sealed partial class ChangelingShopActionEvent : InstantActionEvent
+{
+
+}