Kharidian Desert Overhaul

[SirFancyBacon]

Scope:
Upgrade Kharidian region to better reflect the vanilla visual styles while fixing blending issues, ensuring Winter theme is disregarded within the region as; it clearly wouldn't be snowing there, and general ugliness correction.

Reason:
117 did not have the tools we have not to do proper tile sorting and texturing based on HSL values and locked the sand to a single color, hue and saturation to resolve horrible brightness problems as well as mixed up grass\sand\dirt textures in the desert and on its borders.

Technical notes:

• Uses a hue adjustment instead of a fixed hue value; Improves visual blending.
• Cap brightness of grass and sand to avoid "hot spots"; Visual improvement.
• Use resolver tiles to select grass, dirt, and sand dynamically; reduces visual bugs.
• Original 117 sand kept in as "KHARID_DESERT_SAND"; is currently overwritten entirely by new sand and serves no purpose; Held for legacy.
• Winter theme does not impact grass defined in this area by design.
• Defines a new version of the gravel material without a normal map to correct visual bugs impacting vertical tiles

Comparisons:

Vanilla\Current\Proposed:

[SirFancyBacon]

Some of these served no logical purpose. another i extended to correct an overworld bug.
Arguably could be renamed to "Mage Training Arena Grass" as short of the one fix that is all it is at this point.