Add currency settings, Settings service, and dialog to select fiat currency. Add support for non Official currencies like DOGE when using rates.

src/utils/paths.ts

@@ -35,10 +35,17 @@ export function getDataDir(): string {
 }
 
 /**
- * File storing the last-used mnemonic reference for `-m` omission.
+ * File storing CLI settings (JSON), including the last-used mnemonic reference.
+ */
+export function getSettingsPath(): string {
+  return join(getConfigDir(), ".wallet");
+}
+
+/**
+ * @deprecated Prefer {@link getSettingsPath}.
  */
 export function getWalletConfigPath(): string {
-  return join(getConfigDir(), ".wallet");
+  return getSettingsPath();
 }
 
 /**