General slime improvements (#23425)

* General slime improvements

* Finish morphing

* oops 2x2 not 3x3

* actually lets ball - 2x3 inventory

* Last two things on the todo list

* .\RobustToolbox\

* JUST COMPILE

* fix tests 2.0

* fix tests 3.0

* Do reviews

* minor change

* guideboob

* more

---------

Co-authored-by: Kara <lunarautomaton6@gmail.com>

Content.Shared/Geras/SharedGerasSystem.cs

@@ -0,0 +1,16 @@
+using Content.Shared.Actions;
+
+namespace Content.Shared.Geras;
+
+/// <summary>
+/// A Geras is the small morph of a slime. This system handles exactly that.
+/// </summary>
+public abstract class SharedGerasSystem : EntitySystem
+{
+
+}
+
+public sealed partial class MorphIntoGeras : InstantActionEvent
+{
+
+}