Re-organize all projects (#4166)

Content.Shared/EffectBlocker/IEffectBlocker.cs

@@ -0,0 +1,15 @@
+#nullable enable
+using Content.Shared.ActionBlocker;
+
+namespace Content.Shared.EffectBlocker
+{
+    /// <summary>
+    /// This interface gives components the ability to block certain effects
+    /// from affecting the owning entity. For actions see <see cref="IActionBlocker"/>
+    /// </summary>
+    public interface IEffectBlocker
+    {
+        bool CanFall() => true;
+        bool CanSlip() => true;
+    }
+}