Add Oulipo::Formatt*r

[ecmendenhall]

Fix for #3

• Modify Formatt*r to block that fifth glyph and variants.
• Swap out Formatt*r in /app/vi*ws/api/v1/status*s/_show
• Add FIFTH_GLYPH_R*G*X to spot invalid glyphs.
• Walk toots with Nokogiri to swap invalid glyphs. (Won't touch links or @'s)

I am not following our norms in all this Ruby...might call it a goal, but not now, I don't think.

[mouse-reeve]

this is just what I was looking for, thank you!