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Fixes instances with missing assignment operator or copy constructor.
These are dangerous cases with dynamic memory as it's not obvious what
will happen, but the compiler will try anyway.

In many cases we can simply switch to unique_ptr or disable the copy
when it makes sense. But one or two cases required additional thought.

This fixes several memory leaks or sources of corruption if the fields
fall out of sync

These are various places where cppcheck now understands c++-17, or we
have improve our code

This should trigger a build whilst fixing a single warning

Modernises the codebase from nested workspaces to modern form. E.g.:

namespace A{
namespace B {}
}

Becomes
namespace A::B{
}

This will allow us to specify in the coding standards to prefer the
simple form instead