Merge branch 'remove-animation-export': drop mcrfpy.Animation from public exports

Pre-1.0 API freeze (Group C). PyAnimationType moves from exported_types[]
to internal_types[]; drawable.animate(...) and mcrfpy.animations remain
unchanged because they construct/return Animation via C++ (make_shared +
tp_alloc), not via the Python module attribute.

mcrfpy.Animation(...) is intentionally gone — Animation lifetime is bound
to a single target object, which is more naturally expressed as
obj.animate(...). No backward-compat shim per the freeze policy.

Tests that import mcrfpy.Animation will fail and need updating in a
separate pass.

src/McRFPy_API.cpp

@@ -497,9 +497,6 @@ PyObject* PyInit_mcrfpy()
         /*grid layers (#147)*/
         &PyColorLayerType, &PyTileLayerType,
 
-        /*animation*/
-        &PyAnimationType,
-
         /*timer*/
         &PyTimerType,
 
@@ -574,6 +571,10 @@ PyObject* PyInit_mcrfpy()
         /*shader uniform collection - returned by drawable.uniforms but not directly instantiable (#106)*/
         &mcrfpydef::PyUniformCollectionType,
 
+        /*animation - constructed internally by drawable.animate() and returned by mcrfpy.animations,
+          but not directly instantiable from Python (pre-1.0 API freeze)*/
+        &PyAnimationType,
+
         nullptr};
     
     // Set up PyWindowType methods and getsetters before PyType_Ready