Optimise conditional compiles & package dependencies

[thompson-tomo]

Gone through and cleaned up conditional compilations to reduce future maintenance and removed redundant conditional code.

At the same time some packages have become conditional when they can be provided by the framework.

[mythz]

Thanks for the big PR! Can you also approve the Contributor License Agreement so we can look at merging this, thanks.

[mythz]

We don't want to mix whitespace changes with other code changes in the same PR which makes it a huge PR for us to inititally review and and for others later when looking through the code base commit history. If you can remove the whitespace changes we can look at accepting the build symbol changes separately.

For widespread whitespace changes like this we'll look at running a tool like tool like dotnet format ideally from a GitHub action.

[thompson-tomo]

Currently working through painfully removing white space changes.

[mythz]

Wouldn't it be easier to stash your symbol changes, then reset back your codebase back to head then reapply your symbol changes?

This PR is currently in conflict, not sure it's going to be mergeable after your changes. IMO its better to start with a clean PR.

[thompson-tomo]

Whitespace changes should now all be reverted and merge conflict was easily fixed. 😃