Minor bugfix to explicitly enforce admin permissions on admincp tools
Fixes a critical upgrade bug (doesn't apply to new installs), where certain columns didn't get created
- update permission phrase to make it clear where the permission comes from
- rename user agent table from xf_user_agent to xf_aqp_user_agent to comply with resource standards
- bugfix - gracefully handle case where user agent doesn't exist for user
- fix approval_item_user template modification for compatibility with XF 2.3