Post Friction 2.10.1

• If installer, require Redis cache v1.15.0+ (hard-requrie redis to support lua)
• Purge a number of old unused phrases
• Count attach bb-code & bimg from Advanced bbcodes-pack add-on as a media bb-code for the "warn on media" post-friction option
• Add "No media" post-friction option

• On the thread/forum friction options edit page, fix showing the current value as the default

• Harden how post friction options are saved to avoid unexpectedly resetting non-rendered options

• Fix admincp quicksearch could error when searching for /
• Adjust phrases used when "Bypass post friction restrictions" permission is granted

• Fix 'Undefined array key "warnOnMultiPostForThreadStarter"' error.
• Fix global defaults for "Only allow a single moderated reply"/"Warn on multiple posts for thread starter" options did not work

• Fix viewing an old thread did not include the error message for the thread being too old

• Require php 7.2+
• Require Standard Library by Xon v1.18.0+
• Add some in-request caching to avoid recomputing a thread's post friction configruation mutliple times
• Rework post-friction option definitions to be more easily extendable and easier to maintain.

• Revise various post friction warning messages
• Add "Accept post friction warning" permission to 'guest' user-group for posting-before-registering support (if it hasn't been assigned)

• Fix post friction warning banner being displayed for general thread errors (ie user posting to a thread which was just locked)

• Fix 'Warn on media' option not showing the 'accept post friction dialog' box on replying.