core: encrypt chat database (#988)

* core: encrypt chat database

* check DB key error on start

* function to encrypt database

* encrypt database command

* decrypt, rekey

* remove rekey, refactor

* test for db encryption/decryption

* update simplexmq

src/Simplex/Chat/View.hs

@@ -875,7 +875,7 @@ viewChatError = \case
     CEActiveUserExists -> ["error: active user already exists"]
     CEChatNotStarted -> ["error: chat not started"]
     CEChatNotStopped -> ["error: chat not stopped"]
-    CEChatStoreChanged -> ["error: chat store changed"]
+    CEChatStoreChanged -> ["error: chat store changed, please restart chat"]
     CEInvalidConnReq -> viewInvalidConnReq
     CEInvalidChatMessage e -> ["chat message error: " <> sShow e]
     CEContactNotReady c -> [ttyContact' c <> ": not ready"]
@@ -932,6 +932,9 @@ viewChatError = \case
     SEConnectionNotFound _ -> [] -- TODO mutes delete group error, but also mutes any error from getConnectionEntity
     SEQuotedChatItemNotFound -> ["message not found - reply is not sent"]
     e -> ["chat db error: " <> sShow e]
+  ChatErrorDatabase err -> case err of
+    DBENotEncrypted -> ["error: chat database is not encrypted"]
+    e -> ["chat database error: " <> sShow e]
   ChatErrorAgent err -> case err of
     SMP SMP.AUTH ->
       [ "error: connection authorization failed - this could happen if connection was deleted,\