Expose ITable paths (#200)

Closes #196

include/networktables/NetworkTable.h

@@ -562,6 +562,11 @@ class NetworkTable : public ITable {
    * does not exist
    */
   std::shared_ptr<nt::Value> GetValue(llvm::StringRef key) const override;
+
+  /**
+   * Gets the full path of this table.
+   */
+  llvm::StringRef GetPath() const override;
 };
 
 #endif  // NETWORKTABLE_H_

include/tables/ITable.h

@@ -482,6 +482,12 @@ class ITable {
    * @param listener the listener to be removed
    */
   virtual void RemoveTableListener(ITableListener* listener) = 0;
+
+  /**
+   * Gets the full path of this table.
+   */
+  virtual llvm::StringRef GetPath() const = 0;
+
 };
 
 #endif  // ITABLE_H_