The GUI now tracks when it becomes disconnected from ChessEngine.
If not currently waiting for a move from ChessEngine, it will
automatically reconnect on the next engine move. If a disconnection
occurs while waiting for a move, the player is asked whether they
want to try again or not.
SPDX License Identifiers are a more compact / standardized
way of representing file license information.
See: https://spdx.dev/resources/use/#identifiers
This was done with the `ambr` search and replace tool.
ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
