Centralize getNodeId and fix references to owner.id (#8230)

src/mesh/NodeDB.h

@@ -5,6 +5,7 @@
 #include <algorithm>
 #include <assert.h>
 #include <pb_encode.h>
+#include <string>
 #include <vector>
 
 #include "MeshTypes.h"
@@ -203,6 +204,9 @@ class NodeDB
     /// @return our node number
     NodeNum getNodeNum() { return myNodeInfo.my_node_num; }
 
+    /// @return our node ID as a string in the format "!xxxxxxxx"
+    std::string getNodeId() const;
+
     // @return last byte of a NodeNum, 0xFF if it ended at 0x00
     uint8_t getLastByteOfNodeNum(NodeNum num) { return (uint8_t)((num & 0xFF) ? (num & 0xFF) : 0xFF); }