broadcast via electrum network, add UTXO warning and context menu

Kyle 🐆requested to merge
kwsantiago/joinstr:improvements-21-22-23-24 into main

Closes #21 #22 #23 #24

  • Use network.broadcast_transaction() instead of external API calls
  • Add ConfigVar declarations in init.py for plugin settings
  • Warn user if no suitable UTXO exists before create/join pool
  • Add Coinjoin context menu to UTXO tab for create/join pool
  • Auto-register preselected UTXO from context menu flow
Edited by Kyle 🐆

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