7DRL 2024 Day 4 updates - UIGrid / mcrfpy.Grid

Massive new set of behaviors:
* Move, resize*, zoom, and pan mcrfpy.Grid instances from Python. Note:
there's a rendering error with resizing, which will have to wait for
after 7DRL.

* Add, remove, and create mcrfpy.Entity instances from Python. The
fields can be edited to change position and sprite. They can be removed
from a grid and/or added to another. the Entity class is closely related
to the EntityCollection class, the Python interface to UIGrid's
std::vector of UIEntities.

* mcrfpy.GridPoint and mcrfyp.GridPointState objects. The GridPoint
class allows access to the "physical" parts of a grid. The
GridPointState class allows access to an entity's knowledge of it. Grids
and Entities have an "at" method that takes a tuple (x,y) and returns
one of these objects.

__repr__ and many other nice things are notably absent - many TODOs were
added to the codebase today. They can get picked up after 7DRL.

src/McRFPy_API.cpp

@@ -140,6 +140,10 @@ PyObject* PyInit_mcrfpy()
     PyModule_AddType(m, &mcrfpydef::PyUIGridPointType);
     PyModule_AddType(m, &mcrfpydef::PyUIGridPointStateType);
     PyModule_AddType(m, &mcrfpydef::PyUIEntityType);
+
+    PyModule_AddType(m, &mcrfpydef::PyUIEntityCollectionIterType);
+    PyModule_AddType(m, &mcrfpydef::PyUIEntityCollectionType);
+
     PyModule_AddType(m, &mcrfpydef::PyUIGridType);