* Rename `LAYOUT` to `LAYOUT_all`
[refactor]
* Add layout/matrix diagram
[docs]
* Correct layout data
Reduce the gap between the encoder/macro section and the alphanumeric
section by 0.25u.
[enhancement]
* Add `LAYOUT_ansi_blocker`
[enhancement]
* Add `LAYOUT_iso_blocker`
[enhancement]
* Fix redundant `layout_aliases` keys
per dunk2k
[bugfix]