Merge #18894: gui: Fix manual coin control with multiple wallets loaded

a8b5f1b133d4f23975a3fbfb7a415b17261466ee gui: Fix manual coin control with multiple wallets loaded (João Barbosa)

Pull request description:

  This PR ensures each loaded wallet has a dedicated coin control in the send view which is manipulated by the coin control dialog.

  This is an alternative to #17457. Two main differences are:
   - scope reduced - no unnecessary changes unrelated to the fix;
   - approach taken - coin control instance now belongs to the send view.

  All problems raised in #17457 reviews no longer apply due to the approach taken - https://github.com/bitcoin/bitcoin/pull/17457#pullrequestreview-319297589 and https://github.com/bitcoin/bitcoin/pull/17457#issuecomment-555920829)

  No change in behavior if only one wallet is loaded.

  Closes #15725.

ACKs for top commit:
  jonasschnelli:
    utACK a8b5f1b133d4f23975a3fbfb7a415b17261466ee
  ryanofsky:
    Code review ACK a8b5f1b133d4f23975a3fbfb7a415b17261466ee. Code changes are very straightforward, just replacing global CCoinControl object with SendCoinsDialog member. Not sure if this means coin control settings are reset between payments. It would be good to note in the PR description or release notes if single wallet behavior is affected
  hebasto:
    ACK a8b5f1b133d4f23975a3fbfb7a415b17261466ee
  Sjors:
    tACK a8b5f1b133d4f23975a3fbfb7a415b17261466ee

Tree-SHA512: 3ad9c51bab6f28ec0e90efbd6f43fa510c81dafb2eff0b8c3724efcee3e030054a10be013e27cefe35763374c5f6d7af8c02658736964f733d7e38b646b5df65

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