Update keymaps

[davidryan59]

5-limit keymap is missing 9/10, 15/16, 16/15, 10/9

Two options:

• Add these into existing 5-limit keymap
• Make a new narrow 5-limit keymap missing out 3/2, 2/1

Experiment with both options. Implement one or both

[davidryan59]

This has been implemented today, on the 5-limit Full keymap, which has also been made the default.