docs(Changelog): add changelog for new features (#6518)

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diff --git a/doc/changelog/pendings/changes_1624436208627288700.md b/doc/changelog/pendings/changes_1624436208627288700.md
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+### Added
+- New cmake option `WITH_STRICT_DATABASE_TYPE_CHECKS` [#5611](https://github.com/azerothcore/azerothcore-wotlk/pull/5611)
+
+### Changed
+- Prevent mixing databases with query holders [#5611](https://github.com/azerothcore/azerothcore-wotlk/pull/5611)
+- Prevent using prepared statements on wrong database [#5611](https://github.com/azerothcore/azerothcore-wotlk/pull/5611)
+- Prevent committing transactions started on a different database [#5611](https://github.com/azerothcore/azerothcore-wotlk/pull/5611)
+- Convert async queries to new query callbacks [#5611](https://github.com/azerothcore/azerothcore-wotlk/pull/5611)
+
+### How to upgrade
+- `PreparedStatement`
+```diff
+- PreparedStatement* stmt = LoginDatabase.GetPreparedStatement(LOGIN_UPD_LOGONPROOF);
++ LoginDatabasePreparedStatement* stmt = LoginDatabase.GetPreparedStatement(LOGIN_UPD_LOGONPROOF);
+```
+- `SQLTransaction`
+```diff
+- SQLTransaction trans = CharacterDatabase.BeginTransaction();
++ CharacterDatabaseTransaction trans = CharacterDatabase.BeginTransaction();
+```
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diff --git a/doc/changelog/pendings/changes_1624436916395082900.md b/doc/changelog/pendings/changes_1624436916395082900.md
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+### Changed
+- New options for loading scripts `static dynamic minimal-static minimal-dynamic` [#5346](https://github.com/azerothcore/azerothcore-wotlk/pull/5346)
+```
+static - Build statically. Default option. for all scripts (As it was before)
+dynamic - Build dynamically. After start support Dynamic Linking Library (DLL) can make separated library for each script. Now don't support
+minimal-static - builds commands and spells statically
+minimal-dynamic - builds commands and spells dynamically. Now don't support
+```
+- Also the default value which is provided by the `SCRIPTS` variable is overwriteable through the `SCRIPTS_COMMANDS, SCRIPTS_SPELLS...` variable.
+- Each subdirectory contains it's own translation unit now which is responsible for loading it's directory
+- If module using deprecated script loader api, you get error message.
+```cmake
+> Module (mod-ah-bot) using deprecated loader api
+```
+
+### How to upgrade
+- For most modules, the `CMakeLists.txt' file is no longer needed
+- Need change script loader file.
+```
+1. Rename extension in file to `.cpp`
+2. Rename general loading function to `Add(module name with replace all whitespace to '_')Scripts()`.
+3. Delete macros `AC_ADD_SCRIPT_LOADER` from `CMakeLists.txt`
+```
+- Example loader script for modules:
+```cpp
+/*
+ * Copyright (C) 2016+ AzerothCore <www.azerothcore.org>, released under GNU AGPL v3 license: https://github.com/azerothcore/azerothcore-wotlk/blob/master/LICENSE-AGPL3
+ */
+
+// From SC
+void AddSC_ServerAutoShutdown();
+
+// Add all scripts
+void Addmod_server_auto_shutdownScripts()
+{
+    AddSC_ServerAutoShutdown();
+}
+```
+- List modules support new script loader api:
+https://github.com/azerothcore/mod-server-auto-shutdown
diff --git a/doc/changelog/pendings/changes_1624773257463469100.md b/doc/changelog/pendings/changes_1624773257463469100.md
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+### Removed
+- Old gossips api [#5414](https://github.com/azerothcore/azerothcore-wotlk/pull/5414)
+
+### How to upgrade
+- `player->ADD_GOSSIP_ITEM(whatever)` -> `AddGossipItemFor(player, whatever)`
+- `player->ADD_GOSSIP_ITEM_DB(whatever)` -> `AddGossipItemFor(player, whatever)`
+- `player->ADD_GOSSIP_ITEM_EXTENDED(whatever)` -> `AddGossipItemFor(player, whatever)`
+- `player->CLOSE_GOSSIP_MENU()` -> `CloseGossipMenuFor(player)`
+- `player->SEND_GOSSIP_MENU(textid, creature->GetGUID())` -> `SendGossipMenuFor(player, textid, creature->GetGUID())`
+
+You also need  `#include "ScriptedGossip.h"` in your cpp files