KIS: removed all references to hard keys
This keyboard do not use the qwerty template: renamed all references
from qwerty to letters
First productive commit: migrated all the keyboard templates to their
hexagonal shape.

Added the image for the hexa keys
Added a xml drawable with the properties of the keys
updates letters.xml, symbols.xml and symbols_shift.xml
not show the flag of the current language on the space key
removed unused images