5.0.0

#3452: Fix issues with Search API
#3499: Remove the email block type
#3500: Fix issue where attempting to access security settings sends you in an endless loop
#3492: Fix TypeError in Streams
#3480: Fix issues with last_post returning an invalid timestamp
#3482: Fix issue where logos are disappearing after saving twice
#3607: Fix issue where PayPal attempts to use a full name even when it's not required
#3612: Fixes an issue where some template hook points are missing
#3584: Privacy Policy Error
#3534: Remove unused columns from core_message_topics table