MCL 2.40

This is a large update. It is recommended that all users upgrade.

Much of the low level code has been revised for faster execution and better memory usage.
Compatibility with the original Minicommand hardware has been included as of 2.40.

Overall firmware functionality has been improved.

Write mode has been deprecated in favour of chain mode.
CUE page has been replaced with a Route page, which works correctly.
Chain mode stability has been refined.

Various other enhancements and fixes are described in the Changelog.