Upgrade to .Net 8 about jube

[richard-churchman]

I have worked through the build issues (which was mainly straggling BinarySerializer use) and the warnings (generally swapping to NotImplementedException). Most issues relate to code in Accord.Net which is being used only very partially for Neural Network training. At some point this code will need to be pruned to leave only the methods implemented.

Upgraded own OS to Fedora 39 to gain support for .Net 8. Also upgraded database 15.4.

Noticed much better build performance, anecdotally.

Testing.

[richard-churchman]

Upgraded AutoMapper to version 13.0.1 for breaking changes.

[richard-churchman]

Some breaking changes in the latest version of AutoMapper relating to the mapping of collections. Added:

.ForMember("Item", opt => opt.Ignore());

To mapping configurations throughout where lists are being mapped.

[richard-churchman]

Narrow scope of ticket to focus on the upgrade to .Net 8 and only upgrading Nuget packages which are not compatible.

[richard-churchman]

Pending a full test and updating of documentation.

[richard-churchman]

Done. Merged to master.