ergodox: Update algernon's keymap to v1.9

ergodox: Update algernon's keymap to v1.9

Overall changes
===============

* `F12` was replaced by an `Fx` key, that activate the **Media** layer
  as a one-shot layer, and also `Alt` as a one-shot modifier.

Base layer changes
==================

* The `Media Stop` key is now a tap-dance key, and resets the device for
  programming on the fourth tap.

Miscellaneous
=============

* `π` can now be entered with UCIS.
* `🐁` can now be entered with UCIS.

Tools
=====

* The `tools/layer-notify` tool was removed, it was an example, which I
  don't use.

`tools/hid-commands`
--------------------

* Now looks at the `DISABLE_APPSEL_START` environment value, and does
  not display an AppSel notification if it is non-empty.
* Will attempt to re-program the keyboard when receiving a `reflash`
  command.
* No longer tries to select Emacs 24 on `APPSEL_EMACS`, rather, it goes
  for any Emacs.
* The `APPSEL_MUSIC` command now includes Kodi in the list too, as the
  last choice.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>