Implement a spell-relax rule also for word-final `-uh` about plains-cree-fsts HOT 1 OPEN

Before implementing these in one go, I've been trying to find some pronunciation guides that use English conventions to describe short and long vowels in English which might sometimes interfere with people's perception of Cree spelling.

Phoneme     Cree grapheme    English spelling alternatives
/a/, /a:/   <a>, <â>         <ah>, <uh>
/e:/        <ê>              <ay> (probably not <ei> nor <ey>)
/i:/        <î>              <ee> (probably not <ea>)
/o:/        <ô>              <aw>, <oh>

I haven't been able to find any on-line dictionary that uses these, though I'm pretty sure I've encountered these earlier.

Anyhow, at this initial stage it would make most sense to only incorporate the commonest ones, and then look into what people actually search with.

from plains-cree-fsts.