…type cache, which (if it works as expected) I think is a bit more efficient

- Removed most Kit references

…n if it exists

next steps:
- get the version from the commit
- pick a version to use if there isn't one...  what would this be? hmmm should be oldest version? want to avoid duplicating the world at this stage :D
- add in the conversion logic, registering the type upgrader and picking upgrades to return the actual type we want to load

- being passed along to Dict2Base() where it can be used to pick the right deserialisation target

…is the key for the type

Just need to test this now with something basic.

…pgrader, just to see it all working'

Also tidied some unused usings