FF8: Increase max texture size to 16384 for external textures + Minor fixes

[myst6re]

Summary

• Non-us version does not use similar addresses in Worldmap.
• When an external texture contains an almost opaque alpha, like 254, the pixel is displayed black, force an opaque color to show the real color of the pixel instead
• texl textures (high res worldmap textures) can only be upscaled to 1024x1024, because source height is incorrect. But it should be incorrect as it replaces low res worldmap textures. So I decided to increase MAX_SCALE a lot. Now it is possible to upscale texl to 16384 (which is the max texture size on my machine).

Motivation

Crash => no crash

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

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Azure Pipelines successfully started running 1 pipeline(s).

[julianxhokaxhiu]

Thank you!