--add Configuration function to be able to store and retrieve vectors…

… of data.

A vector of a supported type of values can now be stored and retrieved  in a Subconfiguration, where the key of each value from the vector will be a string representation of its index. Currently supports up to 1000 values in the vector.

src/esp/core/Configuration.h

@@ -1350,7 +1350,7 @@ class Configuration {
   }
 
   /**
-   * @brief Merges Configuration pointed to by @p config into this
+   * @brief Merges Configuration pointed to by @p src into this
    * Configuration, including all subconfigs.  Passed config overwrites
    * existing data in this config.
    * @param src The source of Configuration data we wish to merge into this