Fixed a number of scrolling behaviours in the ConversationVC
Fixed a bug with the PagedDataObserver when observing associated data (multiple associations with a single paged result were broken)
Fixed a bug with the PagedDataObserver where it would trigger updates for new entries even if the user is offset from the latest data
Fixed a bug where marking as read wasn't working properly
Fixed a bug where outgoing messages were being considered unread
Added an error state for a failed attachment send
Renamed a few types for clarity
Resolved a bunch of TODOs
Fixed a couple of issues where attachment messages would flicker due to thread changing
Fixed a couple of issues with page loading
Connected the global search result select back up
Fixed a couple of bugs with search term highlighting (updated the logic to make the highlighted content follow similar logic to what terms would have actually matched)
Fixed a bug where info messages in search results weren't rendering correctly
Shifted some duplicate query code for global search into variables
Fixed a small bug where sending attachments could incorrectly result in the mentions UI being visible
Fixed a bug where quote content was appearing incorrectly
Consolidated the ShareExtension Item and the ConversationCell.ViewModel into one type (with a more-limited query) to remove duplicate code
Added back a missing asset (deleted a long time ago)
Fixed up quote attachment sending and retrieval
Validated attachment sending and retrieving is working correctly
Re-added the AttachmentUploadJob migration
Removed the legacy Theme code (replaced with SessionUIKit equivalents)
Removed the OWSOrphanDataCleaner (unused)
Removed the OWSReceiptType_Delivery from the OWSOutgoingReceiptManager (unused)
Removed the TSStorageKeys and TSStorageHeaders files (unused)
Removed the LKMessageIDCollection (unused - only had methods for deleting data from the collection)
Removed the OWSPrimaryStorageTrustedKeysCollection and OWSIdentityManager_QueuedVerificationStateSyncMessages (unused)
Removed collections and notifications from OWSProfileManager (unused)