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/gui_utils/about_window.py

@@ -59,7 +59,7 @@ class AboutWindow(QDialog):
             " href=\"https://gitlab.liu.se/da/B-ASIC/-/blob/master/LICENSE\">"
             "MIT-license</a>"
             " and any extension to the program should follow that same"
-            f" license.\n\n*Version: {__version__}*\n\nCopyright 2020-2023,"
+            f" license.\n\n*Version: {__version__}*\n\nCopyright 2020-2025,"
             " Oscar Gustafsson et al."
         )
         label1.setTextFormat(Qt.MarkdownText)