Tap keys

[amclain]

We would like to be able to support tap keys. This is when a key is pressed multiple times in quick succession, and registers as a different AFK event than the key's default.

For example, when holding the left shift key, the default behavior is to send the HID event that the shift key is pressed, which will result in any following letters that are pressed to be capitalized (expected behavior). However, when left shift is tapped twice in quick succession, it registers as a different AFK event which the application uses to send the HID events for an open parenthesis ( to be typed. A user of this keyboard could use tap keys bound to left and right shift to open and close parenthesis when writing code.

[doughsay]

AKA "Tap Dance" from QMK: https://beta.docs.qmk.fm/using-qmk/software-features/feature_tap_dance