Add BrashMonkey's "Spriter Pro" (2D game animation tool) to axmol

[aismann]

See also Discussion #945

BrashMonkey's Spriter

• Upstream: https://github.com/aismann/Spriter4axmol
• Version: work in progress at the moment (Windows first version)
• License: zlib license
• License: GreyGuy stuff => "Copyright_Information_Please_Read.txt" (GreGuy folder)

Spriter Pro will be added as an extension

Some screenshots:

First cpp-test for Spriter Pro

[aismann]

@halx99 Is it ok to add BrashMonkey's "Spriter Pro" (2D game animation tool) to axmol?

Support on my repository: https://github.com/aismann/Spriter4axmol

[aismann]

I will support it on my own site.

[halx99]

nice, I also add to https://github.com/axmolengine/axmol/discussions/694