Remove ThinElement

Author: EZoni

src/pals/kinds/Marker.py

@@ -1,13 +1,17 @@
 from typing import Literal
 
-from .mixin import ThinElement
+from .mixin import BaseElement
 
 
-class Marker(ThinElement):
+class Marker(BaseElement):
     """Zero length element to mark a particular position
 
     The main purpose of this thin element is to name a position in the beamline.
     """
 
     # Discriminator field
     kind: Literal["Marker"] = "Marker"
+
+    # Segment length in meters (m)
+    # Always 0, cannot be modified
+    length: Literal[0.0] = 0.0

src/pals/kinds/mixin/ThinElement.py

@@ -1,3 +1,2 @@
 from .BaseElement import BaseElement  # noqa: F401
 from .ThickElement import ThickElement  # noqa: F401
-from .ThinElement import ThinElement  # noqa: F401