Click Drag Functionality + Refactor Interaction Interfaces (#1125)

Co-authored-by: Víctor Aguilera Puerto <6766154+Zumorica@users.noreply.github.com>
Co-authored-by: ComicIronic <comicironic@gmail.com>
Co-authored-by: Pieter-Jan Briers <pieterjan.briers+git@gmail.com>

Resources/Prototypes/Entities/Markers/drag_shadow.yml

@@ -0,0 +1,7 @@
+- type: entity
+  name: drag shadow
+  id: dragshadow
+  components:
+    - type: Sprite
+      layers:
+        - shader: unshaded