FF8: Add support for palette changes in external textures + optimizations

[myst6re]

Summary

• Support for dynamic palette changes of the same texture.
• Separation of texture identification code and texture modding code
• code to open images (PNG or bimg supported formats) is moved outside the renderer
• Optimization of mod (and game!) texture loading time

Motivation

Support for dynamic palette changes of the same texture.

For example the minimap in the worldmap module.

Separation of texture identification code and texture modding code

In the future we want to bring at least compatibility with the remaster. Separating texture identification part permit reuse and clarity.

ACKs

• I have updated the Changelog.md file
• I did test my code on FF7
• I did test my code on FF8

[julianxhokaxhiu]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[julianxhokaxhiu]

Thank you!