Add slack time scheduling, redid earliest deadline, added max-fan-out and hybrid scheduler, also added example

Also added a couple of tests to reach full test coverage for all core operations.

Closes: #285 (closed) #284 (closed) #281 (closed)

Branched from !469 (merged) so merge that first, I can then rebase if you want to.

b_asic/core_operations.py

@@ -1696,6 +1696,37 @@ class DontCare(AbstractOperation):
     def __str__(self) -> str:
         return "dontcare"
 
+    def get_plot_coordinates(
+        self,
+    ) -> tuple[tuple[tuple[float, float], ...], tuple[tuple[float, float], ...]]:
+        # Doc-string inherited
+        return (
+            (
+                (-0.5, 0),
+                (-0.5, 1),
+                (-0.25, 1),
+                (0, 0.5),
+                (-0.25, 0),
+                (-0.5, 0),
+            ),
+            (
+                (-0.5, 0),
+                (-0.5, 1),
+                (-0.25, 1),
+                (0, 0.5),
+                (-0.25, 0),
+                (-0.5, 0),
+            ),
+        )
+
+    def get_input_coordinates(self) -> tuple[tuple[float, float], ...]:
+        # doc-string inherited
+        return tuple()
+
+    def get_output_coordinates(self) -> tuple[tuple[float, float], ...]:
+        # doc-string inherited
+        return ((0, 0.5),)
+
 
 class Sink(AbstractOperation):
     r"""
@@ -1740,3 +1771,34 @@ class Sink(AbstractOperation):
 
     def __str__(self) -> str:
         return "sink"
+
+    def get_plot_coordinates(
+        self,
+    ) -> tuple[tuple[tuple[float, float], ...], tuple[tuple[float, float], ...]]:
+        # Doc-string inherited
+        return (
+            (
+                (-0.5, 0),
+                (-0.5, 1),
+                (-0.25, 1),
+                (0, 0.5),
+                (-0.25, 0),
+                (-0.5, 0),
+            ),
+            (
+                (-0.5, 0),
+                (-0.5, 1),
+                (-0.25, 1),
+                (0, 0.5),
+                (-0.25, 0),
+                (-0.5, 0),
+            ),
+        )
+
+    def get_input_coordinates(self) -> tuple[tuple[float, float], ...]:
+        # doc-string inherited
+        return tuple()
+
+    def get_output_coordinates(self) -> tuple[tuple[float, float], ...]:
+        # doc-string inherited
+        return ((0, 0.5),)