Add support for tezos voting (proposal and ballot operations)

protob/messages-tezos.proto

@@ -55,6 +55,8 @@ message TezosSignTx {
     optional TezosTransactionOp transaction = 4;    // Tezos transaction operation
     optional TezosOriginationOp origination = 5;    // Tezos origination operation
     optional TezosDelegationOp delegation = 6;      // Tezos delegation operation
+    optional TezosProposalOp proposal = 7;          // Tezos proposal operation
+    optional TezosBallotOp ballot = 8;              // Tezos ballot operation
     /*
      * Tezos contract ID
      */
@@ -120,6 +122,24 @@ message TezosSignTx {
         optional uint64 storage_limit = 5;
         optional bytes delegate = 6;
     }
+    /**
+     * Structure representing information for proposal
+     */
+    message TezosProposalOp {
+        optional bytes source = 1;
+        optional uint64 period = 2;
+        optional uint64 bytes_in_next_field = 3;
+        optional bytes proposals = 4;
+    }
+    /**
+     * Structure representing information for ballot
+     */
+    message TezosBallotOp {
+        optional bytes source = 1;
+        optional uint64 period = 2;
+        optional bytes proposal = 3;
+        optional bytes ballot = 4;
+    }
 }
 
 /**