The title says it all.
Currently (as of Minecraft 1.13-pre2) it is possible to use the '/execute store result' command to copy values from one data-source to another. This is only possible with the numerical types 'byte', 'double', 'float', 'int' and 'short'.
The ability to also use strings in this operation would have an enourmous impact on map-makers because it would allow completely new levels of player-command interaction while expanding on an already existing game mechanic.
Additionally I would suggest to add the players current username as a string into the player.dat structure. With direct access to the Players username mapmakers could use the new string-copying mechanic to create functionality that depends on the player's name, for example creating a player skull of a certain player. With this it would also be able to utilize the names of offline players (by storing it in a different entity).
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