Feature: SmoothMovement, Waypoints, RandomMovement

[WORISX]

Describe your feature request or suggestion in detail

The Cataclysm preservation project did a good implementation over the time on many commits about the smooth movement waypoints, this is a thing that definitely must be included, this behaviour is working the same for retail on any expansion, classic, tbc, wotlk, cataclysm, etc

Describe a possible solution to your feature or suggestion in detail

Include this commits in order to work, taking in note the differences between their TC-Based code and our code to avoid gamebreaking issues:

The-Cataclysm-Preservation-Project/TrinityCore@14cdb1a
The-Cataclysm-Preservation-Project/TrinityCore@c808b98
The-Cataclysm-Preservation-Project/TrinityCore@075a79d
The-Cataclysm-Preservation-Project/TrinityCore@78e0328
The-Cataclysm-Preservation-Project/TrinityCore@55ea7e8
The-Cataclysm-Preservation-Project/TrinityCore@2ead9a1
The-Cataclysm-Preservation-Project/TrinityCore@c2a676b
The-Cataclysm-Preservation-Project/TrinityCore@361ac22
The-Cataclysm-Preservation-Project/TrinityCore@d5f9b8c
The-Cataclysm-Preservation-Project/TrinityCore@7f04fb8
The-Cataclysm-Preservation-Project/TrinityCore@9687131
The-Cataclysm-Preservation-Project/TrinityCore@c7540fc
The-Cataclysm-Preservation-Project/TrinityCore@c20838c
The-Cataclysm-Preservation-Project/TrinityCore@c3e9861
The-Cataclysm-Preservation-Project/TrinityCore@087e7e9
The-Cataclysm-Preservation-Project/TrinityCore@317bc49
The-Cataclysm-Preservation-Project/TrinityCore@82714df
The-Cataclysm-Preservation-Project/TrinityCore@c41fe84
The-Cataclysm-Preservation-Project/TrinityCore@e223762
The-Cataclysm-Preservation-Project/TrinityCore@bd3ca6e
The-Cataclysm-Preservation-Project/TrinityCore@b236bd3

Additional context

There are tons if not thousands of videos where the smoothwaypoints are used on every expansion, the transition between each point in the waypoint movement needs to be smooth, credits to his respective authors, just did research and post the commit posted over time in order to have this working on AzerothCore.

A discussion has been made here TrinityCore/TrinityCore#22863

Some images for clarification:

https://user-images.githubusercontent.com/18347559/50037348-6b3ac080-0010-11e9-8bde-fe54230fbcbb.png

https://user-images.githubusercontent.com/18347559/50037364-96251480-0010-11e9-94f1-7ef9d78330a2.png

https://user-images.githubusercontent.com/18347559/50037593-4b58cc00-0013-11e9-9165-75710ff9b64b.png