Merge bitcoin-core/gui#35: Parse params directly instead of through node (partial revert #10244)

519cae8fd6e44aef3470415d7c5e12acb0acd9f4 gui: Delay interfaces::Node initialization (Russell Yanofsky)
102abff9eb6c267af64f2a3560712147d1896e13 gui: Replace interface::Node references with pointers (Russell Yanofsky)
91aced7c7e6e75c1f5896b7e3843015177f32748 gui: Remove unused interfaces::Node references (Russell Yanofsky)
e1336316250ab5cb0ed654b1e593378a6e0769ce gui: Partially revert #10244 gArgs and Params changes (Russell Yanofsky)

Pull request description:

  This PR is part of the [process separation project](https://github.com/bitcoin/bitcoin/projects/10).

  ---

  This is a partial revert of https://github.com/bitcoin/bitcoin/pull/10244. It changes gui code to go back to using gArgs and Params() functions directly instead of using interfaces::Node to handle arguments.

  These changes were originally pushed as part of https://github.com/bitcoin/bitcoin/pull/19461. Motivation is to support a new GUI process connecting to an already running node process. Details are explained in commit messages, but in addition to spawning a new bitcoin-node process, we want bitcoin-gui to connect to an existing bitcoin-node process. So for that reason it should be able to parse its own parameters, rather than rely on the node.

ACKs for top commit:
  MarcoFalke:
    re-ACK 519cae8fd6, only change is rebase and addressed nits of my previous review last week 🌄

Tree-SHA512: 9c339dd82ba78bcc7b887b84d872f35ccc7dfa3d271691e6eafe8a2048cbbe3bdde1e810ce33d0714d75d048c9de3470e9e9b6f8306a6047d1cb3548f6858dc8

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