feat(doc): changelog system (#6350)

This system provides rules and automatizes (Deno-typescript) the creation of a changelog file to help developers to adapt their code and know what is new with every (pre)release

doc/changelog/README.md

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+# CHANGELOG
+
+All breaking/notable changes to this project will be documented in the master.md file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://www.azerothcore.org/wiki/project-versioning).
+
+To create a new changelog please follow the instructions on our [wiki page](https://www.azerothcore.org/wiki/how-to-use-changelog)

doc/changelog/master.md

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+

doc/changelog/pendings/changes_1623667140221711000.md

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+### Added
+- Created new changelog system.
+
+### How to upgrade
+
+To create a new changelog please follow the instructions on our [wiki page](https://www.azerothcore.org/wiki/how-to-use-changelog)

doc/changelog/pendings/create.sh

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+#!/usr/bin/env bash
+
+unamestr=$(uname)
+echo "OS: $unamestr"
+if [[ "$unamestr" == 'Darwin' ]]; then
+   rev=$(gdate +%s%N );
+else
+   rev=$(date +%s%N );
+fi
+
+CUR_PATH="$( cd "$( dirname "${BASH_SOURCE[0]}" )/" && pwd )";
+
+filename=changes_"$rev".md
+
+echo "Insert your changelog here
+
+### How to upgrade
+
+Add instructions on how to adapt the code to the new changes
+
+" > "$CUR_PATH/$filename" && echo "File created: $filename";

doc/changelog/previous-versions/v2.x.md

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+## We suggest using the latest master branch
+This is old and may not be working.
+We suggest that you always use the latest version of our master branch.
+https://github.com/azerothcore/azerothcore-wotlk/tree/master
+
+## Upgrade instructions
+
+For server administrators: instructions about how to upgrade existing servers are available [here](http://www.azerothcore.org/wiki/Upgrade-from-pre-2.0.0-to-latest-master).
+
+
+## Release notes
+
+I'm pleased to release this new version of AzerothCore. This achievement was only possible thanks to all the contributors of our awesome community.
+
+Special thanks to @talamortis @BarbzYHOOL @Deku @Stoabrogga @poszer @Viste @wetbrownsauce @CookieMonsterDev @Nefertumm @xDevICCI @pangolp @Winfidonarleyan @brussens @Yehonal
+ @comix1988 @Rochet2 @masterking32  @mik1893  @STARRHELD  @a4501150 @Trystanosaurus @FALL1N1 @Kaev  @Ayasecore @Pondaveia @Gargarensis and all the other [developers](https://github.com/azerothcore/azerothcore-wotlk/graphs/contributors), testers, supporters and custom modules/tools developers!
+
+The full list of improvements was just too big to be published here, so I will only add some of the improvements that have been implemented since release 1.x:
+
+- Solved all DB installation issues
+- Implemented AC Docker setup
+- Fixed all DB startup errors
+- Eluna is now supported (special thanks @AyaseCore )
+- Travis now prevents startup DB errors to get on master
+- Fixed all compilation warnings
+- Align most of the DB tables structure with TC
+- Align SmartAI enums with TC
+- Align conditions enums with TC
+- Misc improvements to the SmartAI system
+- The core will now trigger error if unsupported SmartAI action/even/types are used
+- Fixed MySQL 5.7 issues
+- Fixed many Quests (the list is too big to report it here)
+- Improved movement and positioning for vanity pets
+- Fixed clang 7 build
+- Fixed Val'anyr Hammer of Ancient Kings
+- Fixed Amplify Damage
+- Update waypoints for black knight in Trail of the champion to be more blizzlike
+- Fixed Mage Empowered Fire Talent
+- Warlock Life Tap
+- Fixed Mirror Image
+- Added a few custom commands
+- Fixed Glyph Learning for dual talent
+- Fixed Deathgrip
+- Fixed Rogue Tier 1 proc
+- Fixed Guild Charter
+- Fixed heirlooms to apply stats before giving health.
+- Fixed pet bar will now show after /reload command
+- Fixed npc falling through textures
+- Fixed Noth the Plaguebringer casting upon returning back to ground
+
+...and many other improvements! You can check the full changelog [here](https://github.com/azerothcore/azerothcore-wotlk/commits/master).