Configurations: Allow renaming of components

As an instrument scientist, particularly on LET, I would like an easy way to rename components. Currently to do this I will have to:

* Save `old_component` as `new_component`
* Go through all the configurations that use `old_component`, remove `old_component` and add `new_component`
* Delete `old_component`

This is a rather fiddly process.

## Acceptance Criteria
* Via the GUI I can rename a component and it will update all configurations that depend on it
* It is clear to the user this is what it's doing
* There are tests for this