lnrpc: add new SendAll field to SendCoinsRequest

lnrpc/rpc.proto

@@ -837,6 +837,13 @@ message SendCoinsRequest {
 
     /// A manual fee rate set in sat/byte that should be used when crafting the transaction.
     int64 sat_per_byte = 5;
+
+    /**
+    If set, then the amount field will be ignored, and lnd will attempt to
+    send all the coins under control of the internal wallet to the specified
+    address.
+    */
+    bool send_all = 6; 
 }
 message SendCoinsResponse {
     /// The transaction ID of the transaction

lnrpc/rpc.swagger.json

@@ -1288,10 +1288,12 @@
       "type": "object",
       "properties": {
         "chain": {
-          "type": "string"
+          "type": "string",
+          "title": "/ The blockchain the node is on (eg bitcoin, litecoin)"
         },
         "network": {
-          "type": "string"
+          "type": "string",
+          "title": "/ The network the node is on (eg regtest, testnet, mainnet)"
         }
       }
     },
@@ -2782,6 +2784,11 @@
           "type": "string",
           "format": "int64",
           "description": "/ A manual fee rate set in sat/byte that should be used when crafting the transaction."
+        },
+        "send_all": {
+          "type": "boolean",
+          "format": "boolean",
+          "description": "*\nIf set, then the amount field will be ignored, and lnd will attempt to\nsend all the coins under control of the internal wallet to the specified\naddress."
         }
       }
     },