Done Make the /tier commands for National Dex formats more consistent

[Gleeboop]

Its a bit annoying that you need to fully type out /tier nationaldex (uu, bh, monotype) when /tier natdex and /tier natdex ag both work. It would be nice to be able to abbreviate all national dex tiers as natdex (whatever)

 

[Distrib]

Done! This will be in place when it is accepted and there is a hotpatch.