inet(evdev) messes with HKTG, so disable it.
Add my custom layouts.
Fixed up alt and altgr keys.
Use custom keycodes for TE alt keys.

This moves them away from regular alt and altGr, which allows us to fiddle
their symbols without messing with the functioning of the originals. This
is primarily important when attempting to leave the laptop keyboard at
default mapping while only remapping keys on the TE keyboard when attached.