elm_entry: using keycode for main keyboard shortcuts

elm_entry: using keycode for main keyboard shortcuts

Previously we use key strings to detect keyboard shortcuts (for example copy/paste/select_all, .. etc)
Now we will use key code alongside with these key strings (I do not remove the key string, because I am afraid something depends on them because some methods do not send keycode with keys)

This issue can be easily detected when the keyboard layout is not a Latin language, for example Hitting "C" will produce key string depends on related language not letter C, but Keycodes remain the same regardless of keyboard layout.

Reviewed-by: Marcel Hollerbach <mail@marcel-hollerbach.de>
Differential Revision: https://phab.enlightenment.org/D11606