Update enabled subreddits in main loop
Add body_min_length and body_max_length checks
user_conditions: make shadowbanned users fail

Previously, shadowbanned users were returning 0 for all attrs like
account_age, karma, etc. This changes it so that they will simply
never satisfy any user_conditions check (except rank, which will
still work whether the user is shadowbanned or not).
Make mods immune to remove/spam/report checks