Add moderator group, anon and deleted_on field to app.sql

Signed-off-by: JWhy <jwhy@jwhy.de>
Add is_mod check to base controller (allows frontend comment deletion for mods)

Signed-off-by: JWhy <jwhy@jwhy.de>
Rename 'anon' field to 'hidden' in app.sql

Signed-off-by: JWhy <jwhy@jwhy.de>
Implement comment hiding, fix foreign profile view indention

Signed-off-by: JWhy <jwhy@jwhy.de>