add tor support bool to CryptoCurrency and override in coin impls

lib/wallets/crypto_currency/coins/bitcoin.dart

@@ -25,6 +25,9 @@ class Bitcoin extends Bip39HDCurrency with PaynymCurrencyInterface {
   // change this to change the number of confirms a tx needs in order to show as confirmed
   int get minConfirms => 1;
 
+  @override
+  bool get torSupport => true;
+
   @override
   List<DerivePathType> get supportedDerivationPathTypes => [
         DerivePathType.bip44,

lib/wallets/crypto_currency/coins/bitcoin_frost.dart

@@ -23,6 +23,9 @@ class BitcoinFrost extends FrostCurrency {
   @override
   int get minConfirms => 1;
 
+  @override
+  bool get torSupport => true;
+
   @override
   NodeModel get defaultNode {
     switch (network) {

lib/wallets/crypto_currency/coins/bitcoincash.dart

@@ -34,6 +34,9 @@ class Bitcoincash extends Bip39HDCurrency {
   // change this to change the number of confirms a tx needs in order to show as confirmed
   int get minConfirms => 0; // bch zeroconf
 
+  @override
+  bool get torSupport => true;
+
   @override
   List<DerivePathType> get supportedDerivationPathTypes => [
         DerivePathType.bip44,

lib/wallets/crypto_currency/coins/dogecoin.dart

@@ -20,6 +20,9 @@ class Dogecoin extends Bip39HDCurrency {
     }
   }
 
+  @override
+  bool get torSupport => true;
+
   @override
   List<DerivePathType> get supportedDerivationPathTypes => [
         DerivePathType.bip44,

lib/wallets/crypto_currency/coins/ecash.dart

@@ -32,6 +32,9 @@ class Ecash extends Bip39HDCurrency {
   // change this to change the number of confirms a tx needs in order to show as confirmed
   int get minConfirms => 0; // bch zeroconf
 
+  @override
+  bool get torSupport => true;
+
   @override
   List<DerivePathType> get supportedDerivationPathTypes => [
         DerivePathType.eCash44,

lib/wallets/crypto_currency/coins/firo.dart

@@ -24,6 +24,9 @@ class Firo extends Bip39HDCurrency {
   @override
   int get minConfirms => 1;
 
+  @override
+  bool get torSupport => true;
+
   @override
   List<DerivePathType> get supportedDerivationPathTypes => [
         DerivePathType.bip44,

lib/wallets/crypto_currency/coins/litecoin.dart

@@ -24,6 +24,9 @@ class Litecoin extends Bip39HDCurrency {
   // change this to change the number of confirms a tx needs in order to show as confirmed
   int get minConfirms => 1;
 
+  @override
+  bool get torSupport => true;
+
   @override
   List<DerivePathType> get supportedDerivationPathTypes => [
         DerivePathType.bip44,

lib/wallets/crypto_currency/coins/namecoin.dart

@@ -22,6 +22,9 @@ class Namecoin extends Bip39HDCurrency {
   // See https://github.com/cypherstack/stack_wallet/blob/621aff47969761014e0a6c4e699cb637d5687ab3/lib/services/coins/namecoin/namecoin_wallet.dart#L58
   int get minConfirms => 2;
 
+  @override
+  bool get torSupport => true;
+
   @override
   // See https://github.com/cypherstack/stack_wallet/blob/621aff47969761014e0a6c4e699cb637d5687ab3/lib/services/coins/namecoin/namecoin_wallet.dart#L80
   String constructDerivePath({

lib/wallets/crypto_currency/coins/particl.dart

@@ -22,6 +22,9 @@ class Particl extends Bip39HDCurrency {
   // See https://github.com/cypherstack/stack_wallet/blob/d08b5c9b22b58db800ad07b2ceeb44c6d05f9cf3/lib/services/coins/particl/particl_wallet.dart#L57
   int get minConfirms => 1;
 
+  @override
+  bool get torSupport => true;
+
   @override
   // See https://github.com/cypherstack/stack_wallet/blob/d08b5c9b22b58db800ad07b2ceeb44c6d05f9cf3/lib/services/coins/particl/particl_wallet.dart#L68
   String constructDerivePath(

lib/wallets/crypto_currency/crypto_currency.dart

@@ -20,6 +20,9 @@ abstract class CryptoCurrency {
   // (used for eth currently)
   bool get hasTokenSupport => false;
 
+  // Override in subclass if the currency has Tor support:
+  bool get torSupport => false;
+
   // TODO: [prio=low] require these be overridden in concrete implementations to remove reliance on [coin]
   int get fractionDigits => coin.decimals;
   BigInt get satsPerCoin => Constants.satsPerCoin(coin);