Update monsterfeatures.json
Update monsterfeatures.json

Moved Undead Fortitude to preserve alphabetical sorting.
Added Heated Body, Horrifying Visage (same as Frightful Presence but better
be redundant for the sake of clarity and people would look for them in
alphabetical order), Shadow Stealth and Web.
TheGiddyLimit/astranauta.github.io,grxanon/grxanon.github.io,TheGiddyLimit/astranauta.github.io,grxanon/grxanon.github.io,grxanon/grxanon.github.io