Inceptionev/experimental nested flow pressure control

[martukas]

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Self-review checklist:

• Self-review: looked through the Files changed tab, browsed repository in branch
• Documentation updated - reflects changes in code, electrical or mechanical design
• Documentation and graphics follow the documentation style guide
• New content is linked, easily discoverable, does not require too many clicks
• Follows other relevant parts of contributor wiki
• PR has a descriptive name
• Tagged relevant reviewers

Software only:

• Follows our code style
• Commented code, particularly in hard-to-understand areas
• All tests pass - new and old, locally and on CI
• No new warnings or static check failures
• Tests that prove fix is effective or new feature works
• Manual tests are explained, with instructions for reproducing them

CAD / mechanical only:

• Follows our mechanical engineering standards
• Everything is metric and ISO where possible
• All features and constraints are named
• Imported parts are well-named, with source URL and iProperties
• Screenshots and/or assembly photos updated