Animation blending and root motion

[Sezzary]

Checklist

• I have added a changelog entry to CHANGELOG.md file on the branch/fork (if it is an internal change then it is not needed)
• Pull request meets the Coding Conventions standards: https://github.com/MontyTRC89/TombEngine/blob/master/CONTRIBUTING.md#coding-conventions

Links to issue(s) this pull request concerns (if applicable)

N/A

Description of pull request

Introduces the following new features:

• Animation blending.
• Root motion.

TODO:

• Investigate crash when unholstering weapons.
• Check if extra code is required for root motion at 60FPS.
• Fix hair teleport.
• Add more 2 or 3 frame blends for certain hardcoded animation dispatches.
• Check if any more merge errors made it in.
• Remove debug code when it's no longer needed.
• Make TE write relevant data to the level.

Related TE PR: TombEngine/Tomb-Editor#1095

[Lwmte]

@Sezzary FYI: GetLastFrame function crashes because it refers to INT_MAX frame number, and GetLastFrame has no bounds checks.