Electrum ABC 5.2.4

• Fix integer overflow for displaying the amount for selected coins (#291).
• Fix a bug when loading an wallet file containing CashAccount contacts (#295).
• Fix bug preventing to freeze or unfreeze multiple coins at once (#297).
• Allow preserving the order of outputs in a transaction when it has an
  OP_RETURN output, for advanced use cases such as manually building SLP
  transactions (#298).
• Code and build toolchain cleanup (#292, #293, #294, #299).