Removed option to send private message if it would go to system. Closes
Removed pm symbol if sent by own user
Added one time binding to ng-if
Removed extraneous space
Merge pull request #4295 from crookedneighbor/do-not-send-private-messages-to-system

Removed option to send private message if it would go to system. Closes #4295
Allow send messages to yourself - see #4295
Adjusted ng-hide so users cannot block themeselves
Merge pull request #4303 from crookedneighbor/develop

Adjusted ng-hide so users cannot block themeselves
feat(Bailey): November subscription reminder
refactor(inventory): move all special items into single category
"special" (cleaner)
refactor(members): DRY some members code
feat(plans): consecutive months & extra months (like a time-card)
feat(gifts): allow gifting from balance
feat(gifts): allow gifting gems from paypal/stripe
feat(gifts): allow gifting subscriptions
feat(plans): consectuive-month subscription perks (gifting)
feat(plans): allow block subscriptions from paypal/stripe
feat(plans): time travelers tab, 1 trinket to buy 1 set
feat(plans): cleanup plans' perks page, rename Time Trinket => Mystic Hourglass